update README.zh.md

Author: donhui

README.zh.md

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 [![GitHub release (latest by date)](https://img.shields.io/github/v/release/donhui/sonar-mybatis)](https://github.com/donhui/sonar-mybatis/releases/)
 [![GitHub All Releases](https://img.shields.io/github/downloads/donhui/sonar-mybatis/total)](https://github.com/donhui/sonar-mybatis/releases/)
 
+[README 英文版](README.md)
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 ## SonarQube MyBatis 插件
 MyBatis SonarQube Plugin ：自定义规则用于检查 MyBatis Mapper XML 文件中的风险 SQL。