Update README.md

Author: HessianZ

README.md

@@ -5,6 +5,19 @@ A simple proxy based on goproxy.
 
 一个基于goproxy的简单http代理，可以指定出口IP地址。
 
+### Usage
+Usage of ./daisy-proxy:
+  -dns="8.8.8.8 8.8.4.4": dns servers
+  -if="": out interface
+  -ip="": out address
+  -listen="localhost:8080": listen on this address and port
+  -verbose=false: verbose output
+  -h   : show help usage
+  
+### Example
+./daisy-proxy -if ppp0
+2015/04/11 10:15:40 DaisyProxy listen on localhost:8080 outgoing from 10.0.0.60
+
 ### Download
 
 * [DaisyProxy For Mac](http://static.hessian.cn/wp-content/uploads/2014/07/daisy-proxy.gz)