feat: add dio,mmkv,baidu_map

fix com.android.support

lib/main.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:get/get.dart';
+import 'package:mmkv/mmkv.dart';
 
 import 'page/home_page.dart';
 import 'page/login_page.dart';
@@ -8,7 +9,10 @@ import 'page/register_page.dart';
 import 'page/splash_page.dart';
 
 
-void main() {
+void main() async{
+  // must wait for MMKV to finish initialization
+  final rootDir = await MMKV.initialize();
+  print('MMKV for flutter with rootDir = $rootDir');
   runApp(const MyApp());
 }