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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 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)