unity-libsodium

I'm just using this to build libsodium via Github Actions, since I do not own a mac device :X.

Builds are uploaded as artifacts from the run action, so just wait patiently and the artifacts will be uploaded.

Useful references:

• https://github.com/netpyoung/unity.libsodium
• https://github.com/jedisct1/libsodium
• https://github.com/microsoft/ClangSharp
• https://github.com/ektrah/nsec