Rust implementation of flx

[jcs090218]

I have ported this great package to Rust for some noticeable speed-up. Maybe it's worth mentioning in the README file? 😃

Package: https://github.com/jcs-elpa/flx-rs
Rust Impls: https://github.com/jcs090218/flx-rs

[jcs090218]

Now we have C# Impls: https://github.com/jcs090218/FlxCs

:)