feat(@schematics/angular): feature PWA in CLI app

Feature PWA support via `@angular/pwa` directly in the new CLI app.

Author: christianliebel

packages/schematics/angular/application/other-files/app.component.html.template

@@ -384,6 +384,12 @@
       <span>Angular Material</span>
     </div>
 
+    <div class="card card-small" (click)="selection.value = 'pwa'" tabindex="0">
+        <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg>
+
+      <span>Add PWA Support</span>
+    </div>
+
     <div class="card card-small" (click)="selection.value = 'dependency'" tabindex="0">
       <svg class="material-icons" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z"/></svg>
 
@@ -407,6 +413,7 @@
   <div class="terminal" [ngSwitch]="selection.value">
       <pre *ngSwitchDefault>ng generate component xyz</pre>
       <pre *ngSwitchCase="'material'">ng add @angular/material</pre>
+      <pre *ngSwitchCase="'pwa'">ng add @angular/pwa</pre>
       <pre *ngSwitchCase="'dependency'">ng add _____</pre>
       <pre *ngSwitchCase="'test'">ng test</pre>
       <pre *ngSwitchCase="'build'">ng build --prod</pre>