Implemented structure for push Notifications

lib/view/pages/talk/chatList.dart

@@ -1,5 +1,6 @@
 
 import 'dart:async';
+import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -26,6 +27,8 @@ class _ChatListState extends State<ChatList> {
   void initState() {
     super.initState();
 
+    FirebaseMessaging.instance.requestPermission();
+
     WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
       _query();
     });