add notification message

src/app/services/server-connection.service.spec.ts

@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { ServerConnectionService } from './server-connection.service';
+
+describe('ServerConnectionService', () => {
+  let service: ServerConnectionService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(ServerConnectionService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});

src/app/services/server-connection.service.ts

@@ -0,0 +1,20 @@
+import { Injectable } from '@angular/core';
+import { environment } from 'src/environments/environment';
+import { HttpClient } from '@angular/common/http';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ServerConnectionService {
+
+  constructor(private http: HttpClient,) { }
+
+  async BaseAPI(): Promise<boolean> {
+    try {
+      await this.http.get(environment.apiURL)
+      return true
+    } catch {
+      return false
+    }
+  }
+}