Add frontend folder & setup frontend project

frontend/allowance-planner-v2/src/main.ts

@@ -0,0 +1,9 @@
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+import { AppModule } from './app/app.module';
+import { defineCustomElements } from '@ionic/pwa-elements/loader';
+
+platformBrowserDynamic().bootstrapModule(AppModule)
+  .catch(err => console.log(err));
+
+// Call the element loader before the bootstrapModule/bootstrapApplication call
+defineCustomElements(window);