feat(menu): add context menu

Closes #3

src/app/app.module.ts

@@ -37,7 +37,7 @@ registerLocaleData(localeDe);
 
 /**
  * TODO
- * 
+ *
  * @param http TODO
  */
 export function createTranslateLoader(http: HttpClient) {
@@ -84,4 +84,5 @@ const providers : Provider[] = [
   providers:
     environment.use_fake_backend ? [providers, fakeBackendProvider] : providers,
 })
-export class AppModule {}
+export class AppModule {
+}