Add EuiAccordion playground story

src/components/accordion/accordion.stories.tsx

@@ -0,0 +1,43 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import type { Meta, StoryObj } from '@storybook/react';
+
+import { EuiAccordion, EuiAccordionProps } from './accordion';
+
+const meta: Meta<EuiAccordionProps> = {
+  title: 'EuiAccordion',
+  component: EuiAccordion,
+  argTypes: {
+    forceState: {
+      options: [undefined, 'closed', 'open'],
+    },
+  },
+  args: {
+    // Component defaults
+    role: 'group',
+    element: 'div',
+    buttonElement: 'button',
+    arrowDisplay: 'left',
+    borders: 'none',
+    initialIsOpen: false,
+    isDisabled: false,
+    isLoading: false,
+    isLoadingMessage: '',
+  },
+};
+
+export default meta;
+type Story = StoryObj<EuiAccordionProps>;
+
+export const Playground: Story = {
+  args: {
+    buttonContent: 'Accordion toggle content',
+    children: 'Accordion content',
+  },
+};