def create(self, key, value):
        """
        Create a new VariableInstance

        :param unicode key: The key
        :param unicode value: The value

        :returns: Newly created VariableInstance
        :rtype: twilio.rest.serverless.v1.service.environment.variable.VariableInstance
        """
        data = values.of({'Key': key, 'Value': value, })

        payload = self._version.create(
            'POST',
            self._uri,
            data=data,
        )

        return VariableInstance(
            self._version,
            payload,
            service_sid=self._solution['service_sid'],
            environment_sid=self._solution['environment_sid'],
        )
Create a new VariableInstance

        :param unicode key: The key
        :param unicode value: The value

        :returns: Newly created VariableInstance
        :rtype: twilio.rest.serverless.v1.service.environment.variable.VariableInstance