FEATURE: add possible values and custom field resource

app/Enumerations/CustomFieldResources.php

@@ -0,0 +1,20 @@
+<?php
+namespace App\Enumerations;
+
+use App\Models\CustomFieldResource;
+
+class CustomFieldResources extends BaseEnumeration
+{
+    public static $items = [];
+
+    public static function init()
+    {
+        // load items from database
+        $types = CustomFieldResource::all(['id', 'name']);
+
+        // push items into collection
+        foreach ($types as $type) {
+            self::push($type->id, $type->name);
+        }
+    }
+}