Changes to Creates an app job

added the pattern ^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$ to the path request parameter appId

media type application/json; charset=utf-8 was changed to application/json for the response status 201

the id response's property pattern ^[\da-z-]{16,}$ was added for the status 201

the started_at response's property pattern ^\d{4}-\d{2}-\d{2}[T ]\d{2}:\d{2}:\d{2}\.{0,1}[0-9]*Z$ was added for the status 201