docs: def create(self, project, subject, **attrs):
          """
          Create a new :class:`UserStory`.
  
          :param project: :class:`Project` id
          :param subject: subject of the :class:`UserStory`
          :param attrs: optional attributes of the :class:`UserStory`
          """
          attrs.update({'project': project, 'subject': subject})
          return self._new_resource(payload=attrs)