code: def create(self, field_type, unique_name):
          
          data = values.of({'FieldType': field_type, 'UniqueName': unique_name, })
  
          payload = self._version.create(
              'POST',
              self._uri,
              data=data,
          )
  
          return FieldInstance(
              self._version,
              payload,
              assistant_sid=self._solution['assistant_sid'],
              task_sid=self._solution['task_sid'],
          )
docs: Create a new FieldInstance
  
          :param unicode field_type: The Field Type of this field
          :param unicode unique_name: An application-defined string that uniquely identifies the new resource
  
          :returns: Newly created FieldInstance
          :rtype: twilio.rest.autopilot.v1.assistant.task.field.FieldInstance