Add storybook README.md file

.storybook/README.md

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+# Storybook
+We're currently using [Storybook](https://storybook.js.org/) as part of our design system. To run Storybook and test some of our UI components, clone the repo and run the following:
+```
+npm install
+npm run storybook
+```
+You should then see:
+> info Storybook started on => http://localhost:6006/
+
+In your browser, navigate to http://localhost:6006/ to see the Storybook application. From here, you'll be able to easily view components and even modify some of their properties.