Added a toast service error to show error messages on the screen isntead of using console.log

src/app/services/toast.service.ts

@@ -0,0 +1,19 @@
+import { Injectable } from '@angular/core';
+import { ToastController } from '@ionic/angular';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ToastService {
+
+  constructor(public toastController: ToastController) { }
+
+  async presentToast(infoMessage: string) {
+    const toast = await this.toastController.create({
+      message: infoMessage,
+      duration: 2000
+    });
+    toast.present();
+  }
+
+}