Update README.md

Author: bobjiangps

README.md

@@ -1,2 +1,11 @@
 # stf_appium_python_sample
 Auto test on remote mobile devices with openstf and appium / 自动化操作远程手机设备基于openstf和appium的python例子
+
+- select random android device, then connect it, then run appium test scripts on remote android device
+- release device resource when test complete
+- no matter where you are, you can contorl local device or remote device as you want
+
+require stf and adb environment.
+for stf environment, please refer to my blog post: https://www.byincd.com/bobjiang/article-0164/ .
+
+![Image text](https://www.byincd.com/media/upload/Bo/2019/02/28/stf_operation_page.png)