Ray is both an executable binary that can be run, and a library that can be used in Rust programs.
Installing the command-line executable
Assuming you have Rust/Cargo installed, run this command in a terminal:
cargo install ray
It will make the ray command available in your PATH if you've allowed the PATH to be modified when installing Rust. cargo uninstall ray uninstalls.
Adding ray library as a dependency
Run this command in a terminal, in your project's directory:
cargo add ray
To add it manually, edit your project's Cargo.toml file and add to the [dependencies] section:
ray = "0.2.0"
The ray library will be automatically available globally.
Read the ray library documentation.