docs(guide): create new page for external resources

The official and external resources  have been split into two different guide sections. Official stays at the index, external gets its own page.

The external resources have also been reorganized and updated, but
I haven't checked if all material is still relevant.

Author: Narretz

docs/content/api/index.ngdoc

@@ -8,6 +8,8 @@ Welcome to the AngularJS API docs page. These pages contain the AngularJS refere
 The documentation is organized into **{@link guide/module modules}** which contain various components of an AngularJS application.
 These components are {@link guide/directive directives}, {@link guide/services services}, {@link guide/filter filters}, {@link guide/providers providers}, {@link guide/templates templates}, global APIs, and testing mocks.
 
+There is also a {@link guide/index} with articles on various topics, and a list of external resources.
+
 <div class="alert alert-info">
 **Angular Prefixes `$` and `$$`**:
 

docs/content/guide/external.ngdoc

@@ -0,0 +1,146 @@
+@ngdoc overview
+@name External Resources
+@sortOrder 560
+@description
+
+This is a collection of external, 3rd party resources for learning and developing Angular.
+
+## Articles, Videos, and Projects
+
+### Introductory Material
+
+* [10 Reasons Why You Should Use AngularJS](http://www.sitepoint.com/10-reasons-use-angularjs/)
+* [10 Reasons Why Developers Should Learn AngularJS](http://wintellect.com/blogs/jlikness/10-reasons-web-developers-should-learn-angularjs)
+* [Design Principles of AngularJS (video)](https://www.youtube.com/watch?v=HCR7i5F5L8c)
+* [Fundamentals in 60 Minutes (video)](http://www.youtube.com/watch?v=i9MHigUZKEM)
+* [For folks with a jQuery background](http://stackoverflow.com/questions/14994391/how-do-i-think-in-angularjs-if-i-have-a-jquery-background)
+
+### Specific Topics
+
+#### Application Structure & Style Guides
+
+* [Architecture, file structure, components, one-way dataflow and best practices](https://github.com/toddmotto/angular-styleguide)
+* [Angular Styleguide](https://github.com/johnpapa/angular-styleguide)
+* [When to use directives, controllers or services](http://kirkbushell.me/when-to-use-directives-controllers-or-services-in-angular/)
+* [Service vs Factory](http://blog.thoughtram.io/angular/2015/07/07/service-vs-factory-once-and-for-all.html)
+
+#### Testing
+
+* **Unit testing:** [Karma](http://karma-runner.github.io), [Using Karma (video)](http://www.youtube.com/watch?v=YG5DEzaQBIc), {@link guide/unit-testing Unit testing}, {@link guide/services#unit-testing Testing services}, [Karma in Webstorm](http://blog.jetbrains.com/webstorm/2013/10/running-javascript-tests-with-karma-in-webstorm-7/)
+* **End-to-End Testing:** [Protractor](https://github.com/angular/protractor)
+
+#### Mobile
+
+* [Angular on Mobile Guide](http://www.ng-newsletter.com/posts/angular-on-mobile.html)
+* [Angular and Cordova](http://devgirl.org/2013/06/10/quick-start-guide-phonegap-and-angularjs/)
+* [Ionic Framework](http://ionicframework.com/)
+
+#### Deployment
+
+##### General
+
+* **Javascript minification: **[Background](http://thegreenpizza.github.io/2013/05/25/building-minification-safe-angular.js-applications/), [ng-annotate automation tool](https://github.com/olov/ng-annotate)
+* **Analytics and Logging:** [Angularyitcs (Google Analytics)](http://ngmodules.org/modules/angularytics), [Angulartics (Analytics)](https://github.com/luisfarzati/angulartics), [Logging Client-Side Errors](http://www.bennadel.com/blog/2542-Logging-Client-Side-Errors-With-AngularJS-And-Stacktrace-js.htm)
+* **SEO:** [By hand](http://www.yearofmoo.com/2012/11/angularjs-and-seo.html), [prerender.io](http://prerender.io/), [Brombone](http://www.brombone.com/), [SEO.js](http://getseojs.com/), [SEO4Ajax](http://www.seo4ajax.com/)
+
+##### Server-Specific
+
+* **Django:** [Tutorial](http://blog.mourafiq.com/post/55034504632/end-to-end-web-app-with-django-rest-framework), [Integrating AngularJS with Django](http://django-angular.readthedocs.org/en/latest/integration.html), [Getting Started with Django Rest Framework and AngularJS](http://blog.kevinastone.com/getting-started-with-django-rest-framework-and-angularjs.html)
+* **FireBase:** [AngularFire](http://angularfire.com/), [Firebase Foundations for AngularJS](http://blog.watchandcode.com/firebase-foundations/), [Realtime Apps with AngularJS and FireBase (video)](http://www.youtube.com/watch?v=C7ZI7z7qnHU)
+* **Google Cloud Platform: **[with Cloud Endpoints](https://cloud.google.com/developers/articles/angularjs-cloud-endpoints-recipe-for-building-modern-web-applications/), [with Go](https://github.com/GoogleCloudPlatform/appengine-angular-gotodos)
+* **Hood.ie:** [60 Minutes to Awesome](http://www.roberthorvick.com/2013/06/30/todomvc-angularjs-hood-ie-60-minutes-to-awesome/)
+* **MEAN Stack: **[Blog post](http://blog.mongodb.org/post/49262866911/the-mean-stack-mongodb-expressjs-angularjs-and), [Setup](http://thecodebarbarian.wordpress.com/2013/07/22/introduction-to-the-mean-stack-part-one-setting-up-your-tools/), [GDL Video](https://developers.google.com/live/shows/913996610)
+* **Rails: **[Tutorial](http://coderberry.me/blog/2013/04/22/angularjs-on-rails-4-part-1/), [AngularJS with Rails4](https://shellycloud.com/blog/2013/10/how-to-integrate-angularjs-with-rails-4), [angularjs-rails](https://github.com/hiravgandhi/angularjs-rails)
+* **PHP: **[Building a RESTful web service](http://blog.brunoscopelliti.com/building-a-restful-web-service-with-angularjs-and-php-more-power-with-resource), [End to End with Laravel 4 (video)](http://www.youtube.com/watch?v=hqAyiqUs93c)
+* **Meteor: **[angular-meteor package](https://github.com/Urigo/angular-meteor)
+
+### Other Languages
+* [ES6, Webpack, and JSPM Starter Project](https://github.com/AngularClass/NG6-starter)
+* [ES6/Typescript Best Practices](https://codepen.io/martinmcwhorter/post/angularjs-1-x-with-typescript-or-es6-best-practices)
+* [Dart](https://github.com/angular/angular.dart.tutorial/wiki)
+* [CoffeeScript Tutorial](http://www.coffeescriptlove.com/2013/08/angularjs-and-coffeescript-tutorials.html)
+
+### More Topics
+
+* **Security:** [video](https://www.youtube.com/watch?v=18ifoT-Id54)
+* **Internationalization and Localization:** [Creating multilingual support](http://www.novanet.no/blog/hallstein-brotan/dates/2013/10/creating-multilingual-support-using-angularjs/)
+* **Authentication/Login: **[Google example](https://developers.google.com/+/photohunt/python), [AngularJS Facebook library](https://github.com/pc035860/angular-easyfb), [Facebook example](http://blog.brunoscopelliti.com/facebook-authentication-in-your-angularjs-web-app), [authentication strategy](http://blog.brunoscopelliti.com/deal-with-users-authentication-in-an-angularjs-web-app), [unix-style authorization](http://frederiknakstad.com/authentication-in-single-page-applications-with-angular-js/)
+* **Visualization:** [SVG](http://gaslight.co/blog/angular-backed-svgs), [D3.js](http://www.ng-newsletter.com/posts/d3-on-angular.html)
+* **Realtime Communication: **[Socket.io](http://www.creativebloq.com/javascript/angularjs-collaboration-board-socketio-2132885), [OmniBinder](https://github.com/jeffbcross/omnibinder)
+
+
+## Tools
+
+* **Getting Started:** [Comparison of the options for starting a new project](http://www.dancancro.com/comparison-of-angularjs-application-starters/)
+* **Debugging:** [Batarang](https://chrome.google.com/webstore/detail/angularjs-batarang/ighdmehidhipcmcojjgiloacoafjmpfk?hl=en)
+* **Editor support:** [Webstorm](http://plugins.jetbrains.com/plugin/6971) (and [video](http://www.youtube.com/watch?v=LJOyrSh1kDU)), [Sublime Text](https://github.com/angular-ui/AngularJS-sublime-package), [Visual Studio](http://madskristensen.net/post/angularjs-intellisense-in-visual-studio-2012)
+* **Workflow:** [Yeoman.io](https://github.com/yeoman/generator-angular) and [Angular Yeoman Tutorial](http://www.sitepoint.com/kickstart-your-angularjs-development-with-yeoman-grunt-and-bower/)
+
+## Complementary Libraries
+
+This is a list of libraries that enhance Angular, add common UI components or integrate with other libraries.
+You can find a full list of Angular external libraries at [ngmodules.org](http://ngmodules.org/).
+
+* **Advanced Routing:** [UI-Router](https://github.com/angular-ui/ui-router)
+* **Authentication:** [Http Auth Interceptor](https://github.com/witoldsz/angular-http-auth)
+* **Internationalization:**
+  - [angular-translate](http://angular-translate.github.io)
+  - [angular-gettext](http://angular-gettext.rocketeer.be/)
+  - [angular-localization](http://doshprompt.github.io/angular-localization/)
+* **RESTful services:** [Restangular](https://github.com/mgonto/restangular)
+* **SQL and NoSQL backends:**
+  - [BreezeJS](http://www.breezejs.com/)
+  - [AngularFire](http://angularfire.com/)
+* **Data Handling**
+  - Local Storage and session: [ngStorage](https://github.com/gsklee/ngStorage)
+  - [angular-cache](https://github.com/jmdobry/angular-cache)
+  - Data Modeling [JS-Data-Angular](https://github.com/js-data/js-data-angular)
+* **Fileupload:**
+  - [ng-file-upload](https://github.com/danialfarid/ng-file-upload)
+  - [blueimp-fileupload for Angular](https://blueimp.github.io/jQuery-File-Upload/angularjs.html)
+* **Specific UI Elements:**
+  - [ngInfiniteScroll](https://sroze.github.io/ngInfiniteScroll/)
+  - [ngTable](https://github.com/esvit/ng-table)
+  - [Angular UI Grid](http://angular-ui.github.io/grid)
+  - [Toaster Notifications](https://github.com/jirikavi/AngularJS-Toaster)
+  - [textAngular Rich Text Editor / contenteditable](http://textangular.com/) (Rich Text Editor /
+    binding to contenteditable)
+  - [Angular UI Map (Google Maps)](https://github.com/angular-ui/ui-map)
+* **General UI Libraries:**
+  - [AngularStrap for Bootstrap 3](http://mgcrea.github.io/angular-strap/)
+  - [Angular Material](https://material.angularjs.org/latest/)
+  - [Angular UI Bootstrap](http://angular-ui.github.io/)
+  - [KendoUI](http://kendo-labs.github.io/angular-kendo/#/)
+  - [Wijmo](http://wijmo.com/tag/angularjs-2/)
+
+## General Learning Resources
+
+### Books
+* [AngularJS: Up and Running](http://www.amazon.com/AngularJS-Running-Enhanced-Productivity-Structured/dp/1491901942) by Brad Green and Shyam Seshadri
+* [Mastering Web App Development](http://www.amazon.com/Mastering-Web-Application-Development-AngularJS/dp/1782161821) by Pawel Kozlowski and Pete Bacon Darwin
+* [AngularJS Directives](http://www.amazon.com/AngularJS-Directives-Alex-Vanston/dp/1783280336) by Alex Vanston
+* [Recipes With AngularJS](http://www.amazon.co.uk/Recipes-Angular-js-Frederik-Dietz-ebook/dp/B00DK95V48) by Frederik Dietz
+* [Developing an AngularJS Edge](http://www.amazon.com/Developing-AngularJS-Edge-Christopher-Hiller-ebook/dp/B00CJLFF8K) by Christopher Hiller
+* [ng-book: The Complete Book on AngularJS](http://ng-book.com/) by Ari Lerner
+* [AngularJS : Novice to Ninja](http://www.amazon.in/AngularJS-Novice-Ninja-Sandeep-Panda/dp/0992279453) by Sandeep Panda
+* [AngularJS UI Development](http://www.amazon.com/AngularJS-UI-Development-Amit-Ghart-ebook/dp/B00OXVAK7A) by Amit Gharat and Matthias Nehlsen
+* [Responsive Web Design with AngularJS](http://www.amazon.com/Responsive-Design-AngularJS-Sandeep-Kumar/dp/178439842X) by Sandeep Kumar Patel
+* [Professional AngularJS](http://www.amazon.com/Professional-AngularJS-Valeri-Karpov/dp/1118832078/)
+
+### Videos:
+* [egghead.io](http://egghead.io/)
+
+### Courses
+* **Free online:**
+  [thinkster.io](http://thinkster.io),
+  [CodeAcademy](http://www.codecademy.com/courses/javascript-advanced-en-2hJ3J/0/1),
+  [CodeSchool](https://www.codeschool.com/courses/shaping-up-with-angular-js)
+* **Paid online:**
+  [The Angular Course (115 videos that show you how to build a full app)](http://watchandcode.com/courses/angular-course/),
+  [Pluralsite (3 courses)](http://www.pluralsight.com/training/Courses/Find?highlight=true&searchTerm=angularjs),
+  [Tuts+](https://tutsplus.com/course/easier-js-apps-with-angular/),
+  [lynda.com](http://www.lynda.com/AngularJS-tutorials/Up-Running-AngularJS/133318-2.html),
+  [WintellectNOW (4 lessons)](http://www.wintellectnow.com/Course/Detail/mastering-angularjs)
+* **Paid onsite:**
+  [angularbootcamp.com](http://angularbootcamp.com/)
+