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

plugins/api/classes/Api/Auth/AuthenticatorInterface.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Grav\Plugin\Api\Auth;
+
+use Grav\Common\User\Interfaces\UserInterface;
+use Psr\Http\Message\ServerRequestInterface;
+
+interface AuthenticatorInterface
+{
+    /**
+     * Attempt to authenticate the request.
+     * Returns the authenticated user, or null if this authenticator cannot handle the request.
+     */
+    public function authenticate(ServerRequestInterface $request): ?UserInterface;
+}