update readme

Author: duytq94

README.md

@@ -1,8 +1,12 @@
-# flutter_chat_demo
+# Chat Demo
 
-This is the demo for chat app by Flutter
+## Description:
+* A chat app made by Flutter and Firebase.
+* Support login with google account, chat with any user, send text, image and sticker, update avatar and profile.
+* Watch the video demo to clearly: https://youtu.be/MOHE68LI5Eg
+* Check my general guidance to know more and how to do it:
+https://medium.com/@duytq94/facebook-reactions-with-flutter-9019ce8b95b8
 
-## Getting Started
+## Screenshot:
 
-For help getting started with Flutter, view our online
-[documentation](https://flutter.io/).
+<img src="https://raw.githubusercontent.com/duytq94/flutter-chat-demo/master/screenshots/FlutterChatDemo.gif" height="50%" width="50%">

lib/chat.dart

@@ -1,17 +1,15 @@
 import 'dart:async';
 import 'dart:io';
-import 'dart:typed_data';
 
+import 'package:cached_network_image/cached_network_image.dart';
 import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:firebase_storage/firebase_storage.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:flutter_chat_demo/const.dart';
 import 'package:fluttertoast/fluttertoast.dart';
 import 'package:image_picker/image_picker.dart';
-import 'package:shared_preferences/shared_preferences.dart';
-import 'package:cached_network_image/cached_network_image.dart';
 import 'package:intl/intl.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 class Chat extends StatelessWidget {
   final String peerId;

lib/main.dart

@@ -1,12 +1,13 @@
 import 'dart:async';
 import 'dart:io';
+
 import 'package:cached_network_image/cached_network_image.dart';
-import 'package:flutter/material.dart';
 import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_chat_demo/chat.dart';
 import 'package:flutter_chat_demo/const.dart';
 import 'package:flutter_chat_demo/settings.dart';
 import 'package:google_sign_in/google_sign_in.dart';
-import 'package:flutter_chat_demo/chat.dart';
 
 class MainScreen extends StatefulWidget {
   final String currentUserId;

lib/settings.dart

@@ -1,12 +1,10 @@
 import 'dart:async';
 import 'dart:io';
-import 'dart:typed_data';
 
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:firebase_storage/firebase_storage.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:flutter_chat_demo/const.dart';
 import 'package:fluttertoast/fluttertoast.dart';
 import 'package:image_picker/image_picker.dart';