add a repository for sig-knowledge

Signed-off-by: Nkeven <likai20@iscas.ac.cn>

sig/sig-knowlege/sig_knowledge.md

@@ -19,6 +19,7 @@ Note: The content of this SIG follows the convention described in OpenHarmony's
 
 ## The repository
 - project name：
+  - https://gitee.com/openharmony-sig/knowledge
   - https://gitee.com/openharmony-sig/knowledge_demo_smart_home
   - https://gitee.com/openharmony-sig/online_event
 

sig/sig-knowlege/sig_knowledge_cn.md

@@ -19,6 +19,7 @@
 
 ## 代码仓
 - 代码仓地址：
+  - https://gitee.com/openharmony-sig/knowledge
   - https://gitee.com/openharmony-sig/knowledge_demo_smart_home
   - https://gitee.com/openharmony-sig/online_event
 

sig/sigs.json

@@ -528,10 +528,12 @@
         {
          "sig-name": "sig-knowlege",
          "projects": [
+         "https://gitee.com/openharmony-sig/knowledge"
          "https://gitee.com/openharmony-sig/online_event",
          "https://gitee.com/openharmony-sig/knowledge_demo_smart_home"
          ],
           "project-path":[
+         "NONE"
          "NONE",
          "NONE"
          ]