refactor: move libs

apps/angular/6-structural-directive/src/app/user.store.ts

@@ -0,0 +1,15 @@
+import { Injectable } from '@angular/core';
+import { BehaviorSubject } from 'rxjs';
+import { User } from './user.model';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class UserStore {
+  private user = new BehaviorSubject<User | undefined>(undefined);
+  user$ = this.user.asObservable();
+
+  add(user: User) {
+    this.user.next(user);
+  }
+}