An implementation of CMZ14 credentials in Rust

Ian Goldberg 06922f2d22 Flesh out some comments 4 rokov pred
src 06922f2d22 Flesh out some comments 4 rokov pred
tests a7813bc519 Credential showing and verification 4 rokov pred
Cargo.toml 0c4b8a658e Turn ZKP transcript debugging back off 4 rokov pred