chore(docs): add global lib docs

Author: filipesilva

README.md

@@ -46,6 +46,7 @@ The generated project has dependencies that require **Node 4 or greater**.
 * [Commands autocompletion](#commands-autocompletion)
 * [CSS preprocessor integration](#css-preprocessor-integration)
 * [3rd Party Library Installation](#3rd-party-library-installation)
+* [Global Library Installation](#global-library-installation)
 * [Updating angular-cli](#updating-angular-cli)
 * [Known Issues](#known-issues)
 * [Development Hints for hacking on angular-cli](#development-hints-for-hacking-on-angular-cli)
@@ -287,6 +288,34 @@ npm install moment --save
 npm install @types/moment --save-dev
 ```
 
+### Global Library Installation
+
+Some javascript libraries need to be added to the global scope, as if they were
+loaded via a script tag. We can do this by manually adding these libraries to `window`.
+
+As an example, to install Boostrap 4 this is what you need to do:
+
+First install the needed libraries from `npm`:
+
+```bash
+npm install jquery tether bootstrap@next
+```
+
+Then update `styles.css` by importing the `Bootstrap` styles:
+```
+@import '../node_modules/bootstrap/dist/css/bootstrap.css';
+```
+
+Then add the following to `src/scripts.ts`.
+
+```
+window['jQuery'] = require('jquery')
+window['Tether'] = require('tether')
+require('bootstrap/dist/js/bootstrap');
+```
+
+Now Bootstrap 4 should be working on your app.
+
 ### Updating angular-cli
 
 To update `angular-cli` to a new version, you must update both the global package and your project's local package.

addon/ng2/blueprints/ng2/files/__path__/main.ts

@@ -1,3 +1,5 @@
+import './scripts';
+
 import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
 import { enableProdMode } from '@angular/core';
 import { AppModule, environment } from './app/';

addon/ng2/blueprints/ng2/files/__path__/scripts.ts

@@ -0,0 +1 @@
+// Here you can add some additional Typescript code you need to run before your app