Use nix to run dilithium without installing and building

[longregen]

Hi there!

I wanted to share some example code I created while learning about Dilithium. I'm not a cryptography expert - I just wanted to try out the library and thought others might find these examples useful too.

What's included:

• Simple command-line tools to generate keys, sign messages, and verify signatures
• Base64 encoding of keys/signatures for easier handling
• Nix flake setup that makes it easy to try out Dilithium (just run nix run github:pq-crystals/dilithium)

The Nix integration means anyone can quickly try it out without having to deal with compilation or dependencies. Please feel absolutely free to close this if it's not a good fit for this repository. Happy to adjust things based on feedback!