!144 Create sig project for system applications sig.

* Create sig project for system applications sig.

sig/sig-systemapplications/sig_systemapplications.md

@@ -20,7 +20,7 @@ Defines and builds OpenHarmony system applications, applies for and implements i
   - applications_systemui：https://gitee.com/openharmony/applications_systemui
   - applications_settings: https://gitee.com/openharmony/applications_settings
   - applications_launcher: https://gitee.com/openharmony/applications_launcher
-
+  - system_applications: https://gitee.com/openharmony-sig/system_applications
 
 ## SIG Members
 

sig/sig-systemapplications/sig_systemapplications_cn.md

@@ -20,7 +20,8 @@
   - applications_systemui：https://gitee.com/openharmony/applications_systemui
   - applications_settings: https://gitee.com/openharmony/applications_settings
   - applications_launcher: https://gitee.com/openharmony/applications_launcher
-  
+  - system_applications: https://gitee.com/openharmony-sig/system_applications
+
 ## SIG组成员
 
 ### Leader

sig/sigs.json

@@ -86,6 +86,17 @@
          "projects":"https://gitee.com/openharmony-sig/riscv",
          "project-path":"None"
       },
+      {
+         "sig-name":"sig-systemapplications",
+         "projects":["https://gitee.com/openharmony/applications_systemui",
+                     "https://gitee.com/openharmony/applications_settings",
+                     "https://gitee.com/openharmony/applications_launcher",
+                     "https://gitee.com/openharmony-sig/system_applications"],
+         "project-path":["applications/standard/systemui",
+                         "applications/standard/settings",
+                         "applications/standard/launcher",
+                         "NONE"]
+      },
       {
          "sig-name":"sig-oh-board-website",
          "projects":"https://gitee.com/openharmony-sig/oh-board-website",