Add LICENSE file and distribute it in the crates

[nullr0ute]

There should be a MIT LICENSE file in the repo and also included in the crate manifest.

[kardeiz]

@nullr0ute I added a LICENSE file as requested, though I am not sure what you mean by "included in the crate manifest"?

[decathorpe]

Speaking as another Fedora Linux package maintainer, I'm not sure either - but it would be great if you could publish a new version of the crate that includes the license file.

EDIT: I see the problem now, and will submit a PR to fix it.

[decathorpe]

Can confirm that v1.0.0 crates (both serde_tuple and serde_tuple_macros) now contain the license text 🥳 feel free to close this ticket.