update zh-cn/application-dev/Readme-CN.md.

Signed-off-by: NLiAn <lian15@huawei.com>
Signed-off-by: NLiAn <lian15@huawei.com>

zh-cn/application-dev/Readme-CN.md

@@ -43,6 +43,7 @@
 - API参考
     - [组件参考（基于TS扩展的声明式开发范式）](reference/arkui-ts/Readme-CN.md)
     - [组件参考（基于JS扩展的类Web开发范式）](reference/arkui-js/Readme-CN.md)
+    - [JS服务卡片UI组件参考](reference/js-service-widget-ui/Readme-CN.md)
     - 接口
       -   [JS及TS API参考](reference/apis/Readme-CN.md)
       -   Native API