feat(challenge 7): begin ngrx notification work

apps/ngrx-notification/src/main.ts

@@ -0,0 +1,32 @@
+import { APP_INITIALIZER, enableProdMode, inject } from '@angular/core';
+import { bootstrapApplication } from '@angular/platform-browser';
+import { of } from 'rxjs';
+import { AppComponent } from './app/app.component';
+import { PushService } from './app/backend/push.service';
+import { NotificationService } from './app/data-access/notification.service';
+import { environment } from './environments/environment';
+
+if (environment.production) {
+  enableProdMode();
+}
+
+bootstrapApplication(AppComponent, {
+  providers: [
+    {
+      provide: APP_INITIALIZER,
+      multi: true,
+      useFactory: () => {
+        inject(PushService).init();
+        return () => of(true);
+      },
+    },
+    {
+      provide: APP_INITIALIZER,
+      multi: true,
+      useFactory: () => {
+        inject(NotificationService).init();
+        return () => of(true);
+      },
+    },
+  ],
+}).catch((err) => console.error(err));