* update readme

readme.md

@@ -1,5 +1,9 @@
 ## Overview
-This is the source code of Android APP for Crazepony MINI quadcopter.It could control the quadcopter from an Android device during the Bluetooth 2.1 connection.The Bluetooth BLE supported is coming soon.
+This is the branch of Android client source code for Crazepony MINI quadcopter.It is using Bluetooth 2.1 connection.Crazepony with BT 2.1 is not produce now.
 
 This is the [Android Studio](http://developer.android.com/sdk/index.html) project.So you could import to Android Studio and run from source code easily.
 
+## 概要说明
+这是Crazepony蓝牙2.1客户端APP分支，以后将不会再更新。
+
+这是一个[Android Studio](http://developer.android.com/sdk/index.html)工程，直接导入导Android Studio中就可以编译运行。