Add Enum class to hold expiration times.

Author: Potherca

src/Enum/Time.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types=1);
+
+namespace Pdsinterop\Solid\Auth\Enum;
+
+class Time
+{
+    public const HOURS_1 = 'PT1H';
+    public const MINUTES_10 = 'PT10M';
+    public const MONTHS_1 = 'P1M';
+}