Add storybook

Author: andrewn

.storybook/main.js

@@ -0,0 +1,9 @@
+module.exports = {
+  stories: ['../stories/**/*.stories.js'],
+  addons: ['@storybook/addon-actions', '@storybook/addon-links'],
+  webpackFinal: async config => {
+    // do mutation to the config
+
+    return config;
+  },
+};