!310 Update system application sig reference info and contact info

* Add zulip channel and wechat group for system applications sig.

sig/sig-systemapplications/sig_systemapplications.md

@@ -43,10 +43,11 @@ Defines and builds OpenHarmony system applications, applies for and implements i
 - @sunjunxiong(https://gitee.com/sunjunxiong)
 
  ### Meetings
-- Meeting time：bi-weekly meeting, 19:00 pm on Wednesday
-- Meeting link：in the systemapplications channel of the slack
+- Meeting time：monthly meeting
+- Topic declaration: https://shimo.im/sheets/t8cD88vk8qTJQcdh
+- Meeting link：Notify the participants of the topic in the graphite document by email (be sure to leave the email address when declaring the topic)
 
-### Contact (optional)
-- Mailing list：nicolas.wangfeng@huawei.com;
-- Slack group：[systemapplications](https://app.slack.com/client/T01D9MR6E4W/C022UV7AE3F)
-- Wechat group：NA
+### Contact
+- Mailing list：sig_systemapplication.openharmony.io [Subscribe](https://lists.openatom.io/postorius/lists/sig_systemapplication.openharmony.io/)
+- Zulip channel：[Systemapplication](https://zulip.openharmony.cn/#narrow/stream/1-general/topic/Systemapplication)
+- Wechat group：Leave a message on zulip Systemapplication channel about your wechat and the reason for joining. After passing the review, we will invite you to enter oh systemapplication sig wechat group

sig/sig-systemapplications/sig_systemapplications_cn.md

@@ -43,10 +43,11 @@
 - @sunjunxiong(https://gitee.com/sunjunxiong)
 
 ### 会议
- - 会议时间：双周例会，晚上周三19:00
- - 会议链接：在slack的systemapplications channel
+ - 会议时间：月度例会
+ - 议题申报：https://shimo.im/sheets/t8cD88vk8qTJQcdh
+ - 会议链接：邮件通知石墨文档中的议题参与人（申报议题时务必留下邮箱地址）
 
-### 联系方式(可选)
-- 邮件列表：nicolas.wangfeng@huawei.com;
-- Slack群组：[systemapplications](https://app.slack.com/client/T01D9MR6E4W/C022UV7AE3F)
-- 微信群：NA
+### 联系方式
+- 邮件列表：sig_systemapplication.openharmony.io [点击订阅](https://lists.openatom.io/postorius/lists/sig_systemapplication.openharmony.io/)
+- Zulip频道：[Systemapplication](https://zulip.openharmony.cn/#narrow/stream/1-general/topic/Systemapplication)
+- 微信群：在Zulip Systemapplication频道留言您的微信号以及加入的原因，我们在审核通过后会邀请你进入OH-SystemApplication-SIG微信群