add notification message

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
+    }
+  }
+}