!702 Update Basic Software SIG meeting proposal links

* Update meeting proposal links.

sig/sig-basicsoftwareservice/sig-basicsoftwareservice.md

@@ -125,6 +125,7 @@ Basic Software Services includes the following sub-systems:
 
 ### Meetings
  - Meeting time: Wednesday at 14:00 o'clock, biweekly
+ - Meeting proposal: [OpenHarmony SIG-BasicSoftware Meeting Proposal](https://etherpad.openharmony.cn/p/sig-basicsoftware)
  - Meeting link: Welink
 
 ### Contact (optional)

sig/sig-basicsoftwareservice/sig-basicsoftwareservice_cn.md

@@ -126,6 +126,7 @@
 
 ### 会议
  - 会议时间: 双周三 14:00
+ - 会议申报: [OpenHarmony SIG-BasicSoftware Meeting Proposal](https://etherpad.openharmony.cn/p/sig-basicsoftware)
  - 会议链接: Welink
 
 ### 联系方式(可选)