IssueNo: #I5BP36：add requestPermissions demo

Description: add requestPermissions demo
Sig:SIG_ApplicaitonFramework 
Feature or Bugfix:Feature
Binary Source:No
Signed-off-by: Nwangtiantian <wangtiantian19@huawei.com>

zh-cn/application-dev/quick-start/stage-structure.md

@@ -514,6 +514,8 @@ requestPermissions示例 :
 
 ```json
 {
+    "name": "ohos.abilitydemo.permission.PROVIDER",
+    "reason": "$string:reason",
     "usedScene": {
         "abilities": [
             "AudioAbility",