restructure for backend/frontend separation

frontend/ng-karaoqueue/src/app/app-routing.module.ts

@@ -0,0 +1,11 @@
+import { NgModule } from '@angular/core';
+import { Routes, RouterModule } from '@angular/router';
+
+
+const routes: Routes = [];
+
+@NgModule({
+  imports: [RouterModule.forRoot(routes)],
+  exports: [RouterModule]
+})
+export class AppRoutingModule { }