code: def bulk_add(self, item_id, ref_id=None, tags=None,
                   time=None, title=None, url=None):
          
          self._add_action('add')
          return self
docs: Add an item to list
          See: https://getpocket.com/developer/docs/v3/modify
          :param item_id: int
          :param ref_id: tweet_id
          :param tags: list of tags
          :param time: time of action
          :param title: given title
          :param url: item url
          :return: self for chaining
          :rtype: Pocket