修改readme文件

README.md

 # counter
 
-A new Flutter project.
+使用Bloc创建计数器
 
 ## Getting Started
 
-This project is a starting point for a Flutter application.
+pubspec.yaml文件
+```
+name: flutter_counter
+description: A new Flutter project.
+version: 1.0.0+1
 
-A few resources to get you started if this is your first Flutter project:
+environment:
+  sdk: ">=2.0.0-dev.68.0 <3.0.0"
 
-- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+dependencies:
+  flutter:
+    sdk: flutter
+  flutter_bloc: ^0.18.0
+  meta: ^1.1.6
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+flutter:
+  uses-material-design: true
+```
+
+下载包
+```
+flutter packages get
+```
 
-For help getting started with Flutter, view our
-[online documentation](https://flutter.dev/docs), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.