def create(self, field_type, unique_name):
data = values.of({'<STR_LIT>': field_type, '<STR_LIT>': unique_name, })<EOL>payload = self._version.create(<EOL>'<STR_LIT:POST>',<EOL>self._uri,<EOL>data=data,<EOL>)<EOL>return FieldInstance(<EOL>self._version,<EOL>payload,<EOL>assistant_sid=self._solution['<STR_LIT>'],<EOL>task_sid=self._solution['<STR_LIT>'],<EOL>)<EOL>
Create a new FieldInstance

:param unicode field_type: The unique name or sid of the FieldType. It can be any Built-in Field Type or the unique_name or sid of a custom Field Type.
:param unicode unique_name: A user-provided string that uniquely identifies this resource as an alternative to the sid. Unique up to 64 characters long.

:returns: Newly created FieldInstance
:rtype: twilio.rest.preview.understand.assistant.task.field.FieldInstance