Add PWA infrastructure

src/app/app.module.ts

@@ -16,6 +16,8 @@ import {MonacoEditorModule} from 'ngx-monaco-editor';
 import { APP_BASE_HREF, PlatformLocation } from '@angular/common';
 import { MarkdownModule } from 'ngx-markdown';
 import {ConnectionServiceModule} from 'ng-connection-service';
+import { ServiceWorkerModule } from '@angular/service-worker';
+import { environment } from '../environments/environment';
 
 /**
  * This function is used internal to get a string instance of the `<base href="" />` value from `index.html`.
@@ -46,6 +48,7 @@ export function getBaseHref(platformLocation: PlatformLocation): string {
     MonacoEditorModule.forRoot(),
     MarkdownModule.forRoot(),
     ConnectionServiceModule,
+    ServiceWorkerModule.register('ngsw-worker.js', { enabled: environment.production }),
   ],
   providers: [
     StatusBar,