post https://example.com/v1/createField
This method creates a new field for the specified form.
Create a field for the specified form
POST /api/v1/createField HTTP/1.1
Host: www.formstack.com
api_key=[[app:api_key]]&form=12345&field_type=name&label=Your+Name&description=Please+enter+your+full+name&required=1
curl -X POST -i -d "api_key=[[app:api_key]]&form=12345&field_type=name&label=Your+Name&description=Please+enter+your+full+name&required=1" https://www.formstack.com/api/v1/createField