Adding a LICENSE file

[SgtCoDFish]

Hi! Is there any chance you could add an open source license on this repo?

Currently, without a LICENSE file, I can't use this repo at all without introducing a legal risk. If it was MIT or Apache2 licensed I'd be likely to use this and there'd at least be a chance I could contribute something back.

I totally recognise that this repo hasn't been updated in a while - but I figured it was best to ask 😁 Thanks!