update README.md

README.md

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 # JWT
 > This is a simple tool to sign, verify and show JSON Web Tokens ([JWT](http://jwt.io/)) from the command line, base [jwt-go](https://github.com/dgrijalva/jwt-go).
+
+# Install
+
+```
+➜ go get -u github.com/ehlxr/jwt
+```
+
+# Usage
+
+```
+➜ jwt
+JWT(Json Web Token) 工具
+用于生成、验证、查看 JWT
+
+Usage:
+  jwt [command]
+
+Available Commands:
+  help        Help about any command
+  show        查看 JWT Token
+  sign        JWT 签名
+  verify      JWT token 验证
+
+Flags:
+      --config string   config file (default is $HOME/.jwt.yaml)
+  -h, --help            help for jwt
+  -v, --version         show version of the jwt.
+
+Use "jwt [command] --help" for more information about a command.
+```