Add OnboadingModal story (#3578)

storybook/stories/onboarding_modal.story.js

@@ -0,0 +1,24 @@
+import React from 'react';
+import { Provider } from 'react-redux';
+import { IntlProvider } from 'react-intl';
+import { storiesOf } from '@storybook/react';
+import { action } from '@storybook/addon-actions';
+import en from 'mastodon/locales/en.json';
+import configureStore from 'mastodon/store/configureStore';
+import { hydrateStore } from 'mastodon/actions/store';
+import OnboadingModal from 'mastodon/features/ui/components/onboarding_modal';
+import initialState from '../initial_state';
+
+const store = configureStore();
+store.dispatch(hydrateStore(initialState));
+
+storiesOf('OnboadingModal', module)
+  .add('default state', () => (
+    <IntlProvider locale='en' messages={en}>
+      <Provider store={store}>
+        <div style={{ position: 'absolute' }}>
+          <OnboadingModal onClose={action('close')} />
+        </div>
+      </Provider>
+    </IntlProvider>
+  ));