[Rule] Adding read-only field to response

[vishrutshah]

New property which can only be set by the server can be added to the response

[vishrutshah]

Example:

{
  "id": "1040",
  "message": "The new version has a new read-only property 'customMessageReadOnly' in response that was not found in the old version.",
  "jsonref": "#/paths/~1subscriptions~1{subscriptionId}~1providers~1Microsoft.Storage~1checkNameAvailability/post/200/properties",
  "json-path": "#/paths/subscriptions/{subscriptionId}/providers/Microsoft.Storage/checkNameAvailability/post/200/properties",
  "type": "Info"
}

[vishrutshah]

Test and Doc complete