Compile module on local installation and packaging

[dirkvanvugt]

Hi!

I thought that it would be nice to have a prepare script. This saves a manual npm run build when cloning the project.

It also allows users to directly import this module from Github.

With this pull request you can simply install the module from Github:
npm i https://github.com/dirkvanvugt/baler.git#feature/add-prepare-script-for-building

After installing you can run baler from the local directory by adding it to that respective scripts in the package.json.

This makes it easier to add the module to your project locally.

I hope this helps, keep up the good work!