stub out angular app with webpack 4

src/app/main.ts

@@ -0,0 +1,11 @@
+import { enableProdMode } from '@angular/core';
+import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+
+// tslint:disable-next-line
+require('../scss/styles.scss');
+
+import { AppModule } from './app.module';
+
+// enableProdMode(); // TODO: if production
+
+platformBrowserDynamic().bootstrapModule(AppModule);