Add UNLICENSE file :o)

[r-lyeh]

Hello @laleksic ,
I've seen in one of the YouTube comments that the sources are in the Public Domain.
Could you please include a UNLICENSE license file to the repository?
I'd love to start using tiny_csg in our unlicensed/public-domain game engine/editor :D
Keep up the good work & thanks for this! :D

PS: Sorry to open a Discussion topic instead of an Issue!

[laleksic]

There we go :D! I finally "formalised" it. Sorry for the delay - I'm not around here much.
Thanks for the kind words! I'd really love to see what you make with this!
Feel free to reach out directly if you have any questions or need any help.