Update readme

Author: glkz

README.md

@@ -4,9 +4,7 @@
 [![GoDoc](https://godoc.org/github.com/gamegos/jsend?status.svg)](http://godoc.org/github.com/gamegos/jsend)
 
 
-Simple golang **JSend** library.
-
-See http://labs.omniti.com/labs/jsend for JSend details.
+Golang **JSend** library
 
 
 ## Installation
@@ -20,7 +18,23 @@ $ go get github.com/gamegos/jsend
 import "github.com/gamegos/jsend"
 ```
 
-See [godoc](http://godoc.org/github.com/gamegos/jsend)
+See [API documentation](http://godoc.org/github.com/gamegos/jsend)
+
+## Format
+
+Jsend is a very simple json format to wrap your json responses.
+
+```json
+{
+  "status": "success|fail|error",
+  "data": {
+    "your data": "here..."
+  },
+  "message": "error message when status is error"
+}
+```
+
+See [JSend specification](http://labs.omniti.com/labs/jsend) for details.
 
 
 ## License