Add Enum class representing available Repositories.

Author: Potherca

src/Enum/Repository.php

@@ -0,0 +1,20 @@
+<?php declare(strict_types=1);
+
+namespace Pdsinterop\Solid\Auth\Enum;
+
+use Pdsinterop\Solid\Auth\Repository\AccessToken;
+use Pdsinterop\Solid\Auth\Repository\AuthCode;
+use Pdsinterop\Solid\Auth\Repository\Client;
+use Pdsinterop\Solid\Auth\Repository\RefreshToken;
+use Pdsinterop\Solid\Auth\Repository\Scope;
+
+class Repository
+{
+    public const ACCESS_TOKEN = AccessToken::class;
+    public const AUTH_CODE = AuthCode::class;
+    public const CLIENT = Client::class;
+    public const REFRESH_TOKEN = RefreshToken::class;
+    public const SCOPE = Scope::class;
+    // The USER class is only used by the deprecated password grant
+    // public const USER = \Pdsinterop\Solid\Auth\Repository\User::class;
+}