To create Datastream
        :param datastream: Datastream
        :param options: dict

def create_datastream(self, datastream):
        """
        To create Datastream
        :param datastream: Datastream
        :param options: dict
        """
        raw_datastream = self.http.post('/Datastream', datastream)
        return Schemas.Datastream(datastream=raw_datastream)