feat(demo): add story 1 — Sorano: Rock and Time

plugins/api/classes/Api/Exceptions/UnauthorizedException.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Grav\Plugin\Api\Exceptions;
+
+class UnauthorizedException extends ApiException
+{
+    public function __construct(string $detail = 'Authentication is required.', ?\Throwable $previous = null)
+    {
+        parent::__construct(401, 'Unauthorized', $detail, ['WWW-Authenticate' => 'Bearer'], $previous);
+    }
+}