add template

src/app/app.menu.service.ts

@@ -0,0 +1,20 @@
+import { Injectable } from '@angular/core';
+import { Subject } from 'rxjs';
+
+@Injectable()
+export class MenuService {
+
+    private menuSource = new Subject<string>();
+    private resetSource = new Subject();
+
+    menuSource$ = this.menuSource.asObservable();
+    resetSource$ = this.resetSource.asObservable();
+
+    onMenuStateChange(key: string) {
+        this.menuSource.next(key);
+    }
+
+    reset() {
+       // this.resetSource.next();
+    }
+}