'Create a new UserInstance
:param unicode identity: The identity
:param unicode segment: The segment
:returns: Newly created UserInstance
:rtype: twilio.rest.notify.v1.service.user.UserInstance'

def create(self, identity, segment=values.unset):

    data = values.of({'Identity': identity, 'Segment': segment})
    payload = self._version.create('POST', self._uri, data=data)
    return UserInstance(self._version, payload, service_sid=self._solution['service_sid'])
