Setup GitHub Actions

[doceazedo]

It would be nice to have an action to run these steps on every pull request open:

• Run linting and formatting checks
• Run Jest tests (yet to be created on: #6)
• Run build

And an action to run these on creating a new release:

• Run build
• Bump version (according to the release)
• Publish package to NPM

[doceazedo]

We can use release-it to easily setup a script that runs all those steps and creates a new GitHub release automatically