Adds a reaction to an item.

        Args:
            name (str): Reaction (emoji) name. e.g. 'thumbsup'
            channel (str): Channel where the message to add reaction to was posted.
                e.g. 'C1234567890'
            timestamp (str): Timestamp of the message to add reaction to. e.g. '1234567890.123456'

def reactions_add(self, *, name: str, **kwargs) -> SlackResponse:
        """Adds a reaction to an item.

        Args:
            name (str): Reaction (emoji) name. e.g. 'thumbsup'
            channel (str): Channel where the message to add reaction to was posted.
                e.g. 'C1234567890'
            timestamp (str): Timestamp of the message to add reaction to. e.g. '1234567890.123456'
        """
        kwargs.update({"name": name})
        return self.api_call("reactions.add", json=kwargs)