add a license

[mlewissmith]

HWDATA::PCI ought to be licensed

• https://metacpan.org/pod/ExtUtils::MakeMaker#LICENSE
• https://metacpan.org/pod/CPAN::Meta::Spec#license
• https://dev.perl.org/licenses/
• https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository
• https://opensource.guide/legal/#which-open-source-license-is-appropriate-for-my-project
• https://choosealicense.com/

[mlewissmith]

honestly couldn't care less probably end up with https://unlicense.org/