docs: add story for modal

Author: Alexis

client/modules/IDE/components/Modal.stories.jsx

@@ -0,0 +1,17 @@
+import React from 'react';
+import Modal from './Modal';
+
+export default {
+  title: 'IDE/Modal',
+  component: Modal,
+  argTypes: {
+    onClose: { action: 'onClose' }
+  }
+};
+
+export const ModalDefault = {
+  args: {
+    title: 'Example Modal Title',
+    children: <p>Example modal body</p>
+  }
+};