code: def add(self, *resources):
          
          self.doapi_manager.request(self.url + '/resources', method='POST',
                                     data={"resources": _to_taggable(resources)})
docs: Apply the tag to one or more resources
  
          :param resources: one or more `Resource` objects to which tags can be
              applied
          :return: `None`
          :raises DOAPIError: if the API endpoint replies with an error