add REUSE compliance

[matt-beanland]

Ash is going down path of reuse.software compliant licenses to aid with software BOM, see https://reuse.software

[matt-beanland]

Looks like best thing to do is attribute copyright to all contributors using GitHub link.

installed reuse using brew, then ran reuse lint

Here is the badge for the README.md

[matt-beanland]

tried to add a GitHub workflow, not 100% sure it works