improve repo structure

examples/angular/src/app/app.module.ts

@@ -0,0 +1,13 @@
+import { NgModule } from '@angular/core';
+import { BrowserModule } from '@angular/platform-browser';
+import { OverlayscrollbarsModule } from 'overlayscrollbars-ngx';
+
+import { AppComponent } from './app.component';
+
+@NgModule({
+  declarations: [AppComponent],
+  imports: [BrowserModule, OverlayscrollbarsModule],
+  providers: [],
+  bootstrap: [AppComponent],
+})
+export class AppModule {}