update readme

Author: XGenerationLab

README_zh.md

@@ -16,6 +16,9 @@
 🤖 <a href="https://modelscope.cn/collections/XiYanSQL-Models-4483337b614241">ModelScope</a> |
 🌕 <a href="https://bailian.console.aliyun.com/xiyan">析言GBI</a> 
 <br />
+<a href="https://opensource.org/licenses/Apache-2.0">
+  <img src="https://img.shields.io/badge/License-Apache%202.0-blue.svg" alt="License: Apache 2.0" />
+</a>
 <a href="https://pepy.tech/projects/xiyan-mcp-server"><img src="https://static.pepy.tech/badge/xiyan-mcp-server" alt="PyPI 下载量"></a>
   <a href="https://smithery.ai/server/@XGenerationLab/xiyan_mcp_server"><img alt="Smithery 安装量" src="https://smithery.ai/badge/@XGenerationLab/xiyan_mcp_server" height="20"/></a>
 <a href="https://github.com/XGenerationLab/xiyan_mcp_server" target="_blank">