added basic AccountService

src/app/account/account.service.ts

@@ -0,0 +1,17 @@
+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AccountService {
+
+  userName: string = null;
+
+  constructor(private httpClient: HttpClient) { }
+
+  login(username, password) {
+    return this.httpClient.post<User>
+  }
+
+}