add web notification popup

src/app/services/notification/web-notification-popup.service.ts

@@ -0,0 +1,47 @@
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class WebNotificationPopupService {
+
+  constructor() { }
+
+
+  askNotificationPermission() {
+    
+    // function to actually ask the permissions
+    function handlePermission(permission) {}
+  
+    // Let's check if the browser supports notifications
+    if (!('Notification' in window)) {
+      console.log("This browser does not support notifications.");
+    } else {
+      if(this.checkNotificationPromise()) {
+        Notification.requestPermission()
+        .then((permission) => {
+          handlePermission(permission);
+        })
+      } else {
+        Notification.requestPermission(function(permission) {
+          handlePermission(permission);
+        });
+      }
+    }
+  }
+
+
+  private checkNotificationPromise() {
+    try {
+      Notification.requestPermission().then();
+    } catch(e) {
+      return false;
+    }
+
+    return true;
+  }
+
+  sendNotification(message) {
+    var n = new Notification(message);
+  }
+}