Add package.json

[benjaminws]

Though I just noticed it's actually on npm, it's probably a good idea to have the package metadata here.

[kmpm]

I am actually the one publishing it on npm but I'll gladly remove it so it could be republished using this repository.
I needed it badly on multiple locations/clients so that's why

[benjaminws]

Thanks, glad you did. Was useful for me. We'll see if this gets merged up.