docs(misc): add version-support-status page

Closes angular#16058
Closes angular#16458

Author: petebacondarwin

README.md

@@ -12,6 +12,12 @@ It also helps with server-side communication, taming async callbacks with promis
 and it makes client-side navigation and deep linking with hashbang urls or HTML5 pushState a
 piece of cake. Best of all? It makes development fun!
 
+##### AngularJS will be moving to Long Term Support (LTS) mode on July 1st: [Find out more](misc/version-support-status)
+
+##### Looking for the new Angular? Go here: https://github.com/angular/angular
+
+--------------------
+
 * Web site: https://angularjs.org
 * Tutorial: https://docs.angularjs.org/tutorial
 * API Docs: https://docs.angularjs.org/api
@@ -20,7 +26,6 @@ piece of cake. Best of all? It makes development fun!
 * Core Development: [DEVELOPERS.md](DEVELOPERS.md)
 * Dashboard: https://dashboard.angularjs.org
 
-##### Looking for the new Angular? Go here: https://github.com/angular/angular
 
 Documentation
 --------------------

docs/app/assets/css/docs.css

@@ -934,6 +934,14 @@ toc-container > div > toc-tree > ul > li > toc-tree > ul > li toc-tree > ul li {
   font-size: 13px;
 }
 
+.dev-status span {
+  padding: 2px 8px;
+  border-radius: 5px;
+}
+.security span { background-color: orange; }
+.stable span { background-color: green; color: white; }
+.current span { background-color: blue; color: white; }
+
 @media handheld and (max-width:800px), screen and (max-device-width:800px), screen and (max-width:800px) {
   .navbar {
     min-height: auto;

docs/content/api/index.ngdoc

@@ -3,7 +3,15 @@
 @description
 
 # AngularJS API Docs
-Welcome to the AngularJS API docs page. These pages contain the AngularJS reference materials for version <strong ng-bind="version"></strong>.
+
+<div class="alert alert-warning">
+**AngularJS will be moving to Long Term Support (LTS) mode on July 1st.**: [Find out more](misc/version-support-status).
+</div>
+
+## Welcome to the AngularJS API docs page.
+
+These pages contain the AngularJS reference materials for version <strong ng-bind="version"></strong>.
+
 
 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.

docs/content/misc/version-support-status.ngdoc

@@ -0,0 +1,54 @@
+@ngdoc overview
+@name Version Support Status
+@description
+
+# Version Support Status
+
+This page describes the support status of the significant versions of AngularJS.
+
+<div class="alert alert-info">
+  AngularJS is planning one more significant release, version 1.7, and on July 1, 2018 it will enter a 3 year Long Term Support period.
+</div>
+
+### Until July 1st 2018
+
+Any version branch not shown (e.g. 1.5.x) is no longer being developed.
+
+<table class="dev-status table table-bordered">
+<thead>
+  <tr><th>Version</th><th>Status</th><th>Comments</th></tr>
+</thead>
+<tbody>
+  <tr class="security"><td><span>1.2.x</span></td><td>Security patches only</td><td>Last version to provide IE 8 support</td></tr>
+  <tr class="stable"><td><span>1.6.x</span></td><td>Patch Releases</td><td>Minor features, bug fixes, security patches - no breaking changes</td></tr>
+  <tr class="current"><td><span>1.7.x</span></td><td>Active Development</td><td>1.7.0 (not yet released) will be the last release of AngularJS to contain breaking changes</td></tr>
+</tbody>
+</table>
+
+### After July 1st 2018
+
+Any version branch not shown (e.g. 1.6.x) is no longer being developed.
+
+<table class="dev-status table table-bordered">
+<thead>
+  <tr><th>Version</th><th>Status</th><th>Comments</th></tr>
+</thead>
+<tbody>
+  <tr class="security"><td><span>1.2.x</span></td><td>Long Term Support</td><td>Last version to provide IE 8 support</td></tr>
+  <tr class="stable"><td><span>1.7.x</span></td><td>Long Term Support</td><td>1.7.0 will be the last release of AngularJS to contain breaking changes</td></tr>
+</tbody>
+</table>
+
+### Long Term Support
+
+On July 1st 2018, we will enter a Long Term Support period for AngularJS.
+
+At this time we will focus exclusively on providing fixes to bugs that satisfy at least one of the following criteria:
+
+* A security flaw is detected in the 1.7.x branch of the framework
+* One of the major browsers releases a version that will cause current production applications using AngularJS 1.7.x to stop working
+* The jQuery library releases a version that will cause current production applications using AngularJS 1.7.x to stop working.
+
+### Blog Post
+
+You can read more about these plans in our [blog post announcement](https://blog.angular.io/stable-angularjs-and-long-term-support-7e077635ee9c).