Introduce Category grid page

MediaGalleryCatalogUi/Controller/Adminhtml/Category/Index.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\MediaGalleryCatalogUi\Controller\Adminhtml\Category;
+
+use Magento\Backend\App\Action;
+use Magento\Backend\Model\View\Result\Page;
+use Magento\Framework\App\Action\HttpGetActionInterface;
+use Magento\Framework\Controller\ResultFactory;
+use Magento\Framework\Controller\ResultInterface;
+
+/**
+ * Controller serving the media gallery content
+ */
+class Index extends Action implements HttpGetActionInterface
+{
+    public const ADMIN_RESOURCE = 'Magento_Cms::media_gallery';
+
+    /**
+     * Get the media gallery layout
+     *
+     * @return ResultInterface
+     */
+    public function execute(): ResultInterface
+    {
+        /** @var Page $resultPage */
+        $resultPage = $this->resultFactory->create(ResultFactory::TYPE_PAGE);
+        $resultPage->getConfig()->getTitle()->prepend(__('Categories'));
+
+        return $resultPage;
+    }
+}

MediaGalleryCatalogUi/LICENSE.txt

@@ -0,0 +1,48 @@
+
+Open Software License ("OSL") v. 3.0
+
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