!14509 【轻量级 PR】：update zh-cn/application-dev/application-models/Readme-CN.md.

Merge pull request !14509 from 葛亚芳/N/A

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

@@ -20,6 +20,7 @@
       - [DataShareExtensionAbility（仅对系统应用开放）](datashareextensionability.md)
       - [FormExtensionAbility（服务卡片）](widget-development-stage.md)
       - [StaticSubscriberExtensionAbility](static-subscriber-extension-ability.md)
+      - [WindowExtensionAbility](windowextensionability.md)
     - [AbilityStage组件容器](abilitystage.md)
     - [应用上下文Context](application-context-stage.md)
     - 信息传递载体Want