Add LICENSE file

[robl2e]

Can you add a license file to indicate the license this code falls under?

[uknownothingsnow]

just add wtfpl, you can do whatever you want with the code.

[stokito]

The only one license that doesn’t have issues is 0BSD:

• It’s used by Google for Android part (Toybox) while the WTFPL is blocked.
• The BSD licenses are well known for corporate lawyers and they’ll be fine with it.
• It doesn’t mention the problematic Public Domain but it’s effectively it’s equivalent.
• It’s popular and used even more often WTFPL.
• It’s very short and doesn’t have many versions.
• It’s old and used since 2006

Please use the standard license to avoid fragmentation and confusing.