feat(storybook): add simple story

.storybook/addons.js

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+import '@storybook/addon-actions/register';
+import '@storybook/addon-links/register';

.storybook/config.js

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+import { configure } from '@storybook/react';
+
+// automatically import all files ending in *.stories.js
+const req = require.context('../stories', true, /\.stories\.js$/);
+function loadStories() {
+  req.keys().forEach(filename => req(filename));
+}
+
+configure(loadStories, module);