add-field-to-cf.php

<?php
/*
Plugin Name: Custom Caldera Forms Field
*/
add_filter('caldera_forms_get_field_types', 'slug_add_field');

function slug_add_field($fieldtypes){

	$fieldtypes['field_name'] = array(
		"field"			=>	"Field Name",
		"file"			=>	" " //@todo path to the file for the field itself.
		"category"		=>	"basic", //@todo set category or categories
		"description" 	=> " " //@todo set description
		"setup"			=>	array(
		  //optional
		)
	);
	return $fieldtypes;
}