Update README_cn.md

Author: WinterChenS

doc/README_cn.md

@@ -67,6 +67,8 @@ My Site是由Docker+SpringBoot2.0+Mybatis+thymeleaf等技术实现的个人网
 - 2018-05-03: 发布第一版
 
 
+![diagram](https://github.com/user-attachments/assets/1f9a8188-57f9-4e5e-a3ad-0a40acf2e5d7)
+
 [![Stargazers over time](https://starchart.cc/WinterChenS/my-site.svg)](https://starchart.cc/WinterChenS/my-site)