Added member and invitation endpoints

app/Enums/Role.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Enums;
+
+enum Role: string
+{
+    case Owner = 'owner';
+    case Admin = 'admin';
+    case Manager = 'manager';
+    case Employee = 'employee';
+    case Placeholder = 'placeholder';
+
+}