update zh-cn/application-dev/ability/stage-brief.md.

Signed-off-by: N葛亚芳 <geyafang@huawei.com>

zh-cn/application-dev/ability/stage-brief.md

@@ -110,5 +110,7 @@ Stage模型的应用包的工程目录结构，请参考[OpenHarmony工程介绍
 ## 相关实例
 
 针对Stage模型下的Ability开发，有以下相关实例可供参考：
+
+- [`StageModel`：Stage模型（eTS）（API9）（Full SDK）](https://gitee.com/openharmony/applications_app_samples/tree/master/ability/StageModel)
 - [`MissionManager`：系统任务管理（eTS）（API9）（Full SDK）](https://gitee.com/openharmony/applications_app_samples/tree/master/ability/MissionManager)
 - [`Launcher`：仿桌面应用（eTS）（API9）（Full SDK）](https://gitee.com/openharmony/applications_app_samples/tree/master/ability/Launcher)