update zh-cn/device-dev/porting/Readme-CN.md.

Signed-off-by: Nyao-yueyu <yaoyueyu@huawei.com>

zh-cn/device-dev/porting/Readme-CN.md

@@ -34,6 +34,7 @@ repo init -u https://gitee.com/openharmony-sig/manifest.git -b master -m devboar
     - [板级驱动适配](porting-chip-board-driver.md)
     - [HAL层实现](porting-chip-board-hal.md)
     - [系统组件调用](porting-chip-board-component.md)
+    - [lwIP组件适配](porting-chip-board-lwip.md)
     - [三方组件适配](porting-chip-board-bundle.md)
     - [XTS认证](porting-chip-board-xts.md)
   - [常见问题](porting-chip-faqs.md)