feat(aio): copy example code from angular.io

aio/content/examples/styleguide/js/src/app.js

@@ -0,0 +1,55 @@
+(function(app) {
+
+// #docregion
+// #docregion class-w-annotations
+app.AppComponent =
+    // #docregion component
+    ng.core.Component({
+      selector: 'my-app',
+    // #enddocregion
+    // #docregion view
+      template: '<h1 id="output">My First Angular App</h1>'
+    })
+    // #enddocregion
+    // #docregion class
+    .Class({
+      constructor: function () { }
+    });
+    // #enddocregion
+// #enddocregion
+
+// #docregion bootstrap
+app.AppModule =
+  ng.core.NgModule({
+    imports: [ ng.platformBrowser.BrowserModule ],
+    declarations: [ app.AppComponent ],
+    bootstrap: [ app.AppComponent ]
+  })
+  .Class({
+    constructor: function() {}
+  });
+
+document.addEventListener('DOMContentLoaded', function() {
+  ng.platformBrowserDynamic
+    .platformBrowserDynamic()
+    .bootstrapModule(app.AppModule);
+});
+// #enddocregion
+// #enddocregion
+
+})(window.app || (window.app = {}));
+
+/* Non DSL Approach */
+(function(app) {
+
+// #docregion no-dsl
+app.AppComponent = function  AppComponent () {}
+
+app.AppComponent.annotations = [
+  new ng.core.Component({
+    selector: 'my-app',
+    template: '<h1 id="output">My First Angular App</h1>'
+  })
+];
+// #enddocregion
+})(window.app || (window.app = {}));