Toy scheme implementation in rust, following https://mgattozzi.github.io/2016/11/08/scheme-input.html

Ralph Giles 8b745db8ff Trim input before comparing to `(exit)`.		%!s(int64=8) %!d(string=hai) anos
src	8b745db8ff Trim input before comparing to `(exit)`.	%!s(int64=8) %!d(string=hai) anos
.gitignore	3da3ea1a84 cargo new --bin	%!s(int64=8) %!d(string=hai) anos
Cargo.toml	9e2acc62eb Add minimal repl using rustyline.	%!s(int64=8) %!d(string=hai) anos