Add Github Actions and reformat code

[notoraptor]

Hi @bouthilx ! This is a pull request that adds Github actions to run Javascript and ReactJS testings. CI configuration is located in file .github/workflows/node.js.yml.

I added 2 example tests:

• A test for a simple function
• A test to check what happens when some buttons are clicked in a React component

I also added to Github Actions CI a ci-check script provided by Carbon that checks file formatting, so I added a supplementary commit to fix code format.

What do you think?

[notoraptor]

Closing this one as it is now handled in #4 .