docs: create story for Created.svelte

This will need a refactor at some point by computing the formatted value
as reactive variable depending on the created_at and locale.

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

stories/atoms/Created.stories.ts

@@ -0,0 +1,34 @@
+import type { Meta, StoryObj } from '@storybook/svelte';
+
+import Created from '$lib/components/atoms/Created.svelte';
+
+const meta = {
+	title: 'Atoms/Created',
+	component: Created,
+	tags: ['autodocs'],
+	argTypes: {
+		created_at: {
+			control: 'date',
+			description: 'Date of creation'
+		},
+		created_at_formatted: {
+			control: 'text',
+			description: 'Localised version of created_at'
+		}
+	}
+} satisfies Meta<Created>;
+
+export default meta;
+type Story = StoryObj<typeof meta>;
+
+export const Plain: Story = {
+	args: {
+		created_at: new Date(),
+		created_at_formatted: (function () {
+			const locale = 'en-US';
+			return new Intl.DateTimeFormat(locale).format(new Date());
+		})()
+	}
+};
+
+export const Missing: Story = {};