docs: add story for MainMenu

This allows for studying the MainMenu in isolation.

Signed-off-by: André Jaenisch <andre.jaenisch@posteo.de>

stories/molecules/MainMenu.stories.ts

@@ -0,0 +1,26 @@
+/* Stories for MainMenu molecule.
+ * Copyright (C) 2024 André Jaenisch
+ * SPDX-FileCopyrightText: 2024 André Jaenisch
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import type { Meta, StoryObj } from '@storybook/svelte';
+
+import MainMenu from '$lib/components/molecules/MainMenu.svelte';
+
+const meta = {
+	title: 'Molecules/MainMenu',
+	component: MainMenu,
+	tags: ['autodocs']
+} satisfies Meta<MainMenu>;
+
+export default meta;
+type Story = StoryObj<typeof meta>;
+
+export const Plain: Story = {};