Update example

Author: LyricTian

.gitignore

@@ -26,3 +26,5 @@ _testmain.go
 # OSX
 *.DS_Store
 *.db
+/example/client/client
+/example/server/server

example/README.md

@@ -6,15 +6,17 @@ Run Server
 
 ``` bash
 $ cd example/server
-$ go run main.go
+$ go build server.go
+$ ./server
 ```
 
 Run Client
 ----------
 
 ```
 $ cd example/client
-$ go run main.go
+$ go build client.go
+$ ./client
 ```
 
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