update docs

Signed-off-by: Nzengyawen <zengyawen1@huawei.com>

en/application-dev/background-agent-scheduled-reminder/Readme-EN.md

-# Agent-Powered Scheduled Reminder 
-
-- [Agent-Powered Scheduled Reminder Overview](background-agent-scheduled-reminder-overview.md)
-- [Agent-Powered Scheduled Reminder Development](background-agent-scheduled-reminder-guide.md)

en/application-dev/background-task-management/Readme-EN.md

-# Background Task Management 
-
-- [Background Task Management Overview](background-task-overview.md)
-- [Background Task Management Development](background-task-dev-guide.md)
-

en/application-dev/notification/Readme-EN.md

@@ -3,4 +3,7 @@
 - [Common Event and Notification Overview](notification-brief.md)
 - [Common Event Development](common-event.md)
 - [Notification Development](notification.md)
+- Agent-Powered Scheduled Reminder 
+  - [Agent-Powered Scheduled Reminder Overview](background-agent-scheduled-reminder-overview.md)
+  - [Agent-Powered Scheduled Reminder Development](background-agent-scheduled-reminder-guide.md)
 - [Debugging Assistant Usage](assistant-guidelines.md)

en/application-dev/background-agent-scheduled-reminder/background-agent-scheduled-reminder-overview.md → en/application-dev/notification/background-agent-scheduled-reminder-overview.md

-# Agent-Powered Scheduled Reminder Overview<a name="EN-US_TOPIC_0000001139084594"></a>
+# Agent-Powered Scheduled Reminder Overview
 
 Your application can call the  **ReminderRequest**  class to create scheduled reminders for countdown timers, calendar events, and alarm clocks. When the created reminders are published, the timing and pop-up notification functions of your application will be taken over by the reminder agent in the background, even when your application is frozen or exits.
 

en/application-dev/task-management/Readme-EN.md

+# Task Management 
+
+- Background Task Management
+
+  - [Background Task Management Overview](background-task-overview.md)
+  - [Background Task Management Development](background-task-dev-guide.md)
+  
+- Work Scheduler
+  
+  - [Work Scheduler Overview](work-scheduler-overview.md)
+  - [Work Scheduler Development](work-scheduler-dev-guide.md)
+

en/application-dev/work-scheduler/Readme-EN.md

-# Work Scheduler
-
-- [Work Scheduler Overview](work-scheduler-overview.md)
-- [Work Scheduler Development](work-scheduler-dev-guide.md)

zh-cn/application-dev/background-agent-scheduled-reminder/Readme-CN.md

-# 后台代理提醒
-
-- [后台代理提醒概述](background-agent-scheduled-reminder-overview.md)
-- [后台代理提醒开发指导](background-agent-scheduled-reminder-guide.md)

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

@@ -3,4 +3,7 @@
 - [公共事件与通知概述](notification-brief.md)
 - [公共事件开发指导](common-event.md)
 - [通知开发指导](notification-guidelines.md)
+- 后台代理提醒
+  - [后台代理提醒概述](background-agent-scheduled-reminder-overview.md)
+  - [后台代理提醒开发指导](background-agent-scheduled-reminder-guide.md)
 - [调试助手使用指导](assistant-guidelines.md)