def bulk_add(self, item_id, ref_id=None, tags=None,
                 time=None, title=None, url=None):
        """
        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
        """
        self._add_action('add')
        return self