Please add a license to this repo

[mimming]

Thanks a lot for sharing the code for your awesome nixie Arduino shield. I've been hacking away on it, but this repo lacks guidance on how we can use the code (e.g. a license file).

How is this code licensed? Can I share my modified version of the code with the world?

If you don't have strong feelings about any specific license, can you license it under MIT or APL 2.0?

[afch]

I do not understand anything about the types of licenses. I will say simply: you can use it for absolutely any purpose.