Changes to Create issue in project

added the non-success response with the status 409

added the optional property code to the response with the 400 status

added the optional property code to the response with the 401 status

added the optional property code to the response with the 403 status

added the optional property code to the response with the 404 status

added the optional property code to the response with the 500 status

added the new optional request property custom_fields