README: add NixOS/Nix installation instructions

FiloSottile / age

A simple, modern and secure encryption tool (and Go library) with small explicit keys, no config options, and UNIX-style composability.

https://age-encryption.org

BSD 3-Clause "New" or "Revised" License

16.83k stars 492 forks source link

Closed BuriedInTheGround closed 3 years ago

BuriedInTheGround commented 3 years ago

Update README.md with NixOS/Nix installation instructions.