Storybook (#122)

* adding storybook

* update webpack config

* Update package.json

* udpating build script

.storybook/config.js

@@ -0,0 +1,9 @@
+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);