storybook-install_and_stories_examples

[dpfernandes]

Description

Adding Storybook installation files for yarn and adding a button component example

How to test?

yarn storybook

Please provide a short summary how your changes can be tested? You can run storybook by using the command state above and visualize Button component under the title Example with several stories

Checklist

• [x] I have performed a self-review of my own code
• [x] I have followed the name conventions for CSS Classnames and filenames, Components names and filenames, Style filenames, if you are in doubt check the the project README.MD and here https://github.com/HackYourFuture-CPH/curriculum/blob/master/review/review-checklist.md
• [x] I have commented my code, particularly in hard-to-understand areas, if you code was simple enough mark the box anyway
• [x] I have made corresponding changes to the documentation, if you code was simple enough mark the box anyway
• [x] This PR is ready to be merged and not breaking any other functionality