Update readme.java.md to make Resource.resourcegroup and subscriptionid readonly (#24530)

* Update readme.java.md to make Resource.resourcegroup readonly

* Update readme.java.md

* Update readme.java.md to make subscriptionid readonly

Author: haolingdong-msft

specification/deviceprovisioningservices/resource-manager/readme.java.md

@@ -15,9 +15,17 @@ java:
   output-folder: $(azure-libraries-for-java-folder)/deviceprovisioningservices
 
 directive:
-  rename-model:
-    from: 'SharedAccessSignatureAuthorizationRule[AccessRightsDescription]'
-    to: SharedAccessSignatureAuthorizationRule
+  - rename-model:
+      from: 'SharedAccessSignatureAuthorizationRule[AccessRightsDescription]'
+      to: SharedAccessSignatureAuthorizationRule
+  - from: iotdps.json
+    where: $.definitions.Resource.properties.resourcegroup
+    transform: >
+      $["readOnly"] = true
+  - from: iotdps.json
+    where: $.definitions.Resource.properties.subscriptionid
+    transform: >
+      $["readOnly"] = true
 ```
 
 ## Tag: package-2021-10 and java