Update readme.md

Author: binarywang

readme.md

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 ## WxJava - 微信开发 Java SDK（开发工具包）
 
 [![996.icu](https://img.shields.io/badge/link-996.icu-red.svg)](https://996.icu)
+[![996ICU Licence](<https://img.shields.io/badge/license-NPL%20(The%20996%20Prohibited%20License)-blue.svg>)](https://github.com/996icu/996.ICU/blob/master/LICENSE)
+
 [![码云Gitee](https://gitee.com/binary/weixin-java-tools/badge/star.svg?theme=blue)](https://gitee.com/binary/weixin-java-tools)
 [![Github](http://github-svg-buttons.herokuapp.com/star.svg?user=Wechat-Group&repo=WxJava&style=flat&background=1081C1)](https://github.com/Wechat-Group/WxJava)
 [![GitHub release](https://img.shields.io/github/release/Wechat-Group/WxJava.svg)](https://github.com/Wechat-Group/WxJava/releases)