Add GrailSort

[otac0n]

https://github.com/Mrrl/GrailSort

[MusicTheorist]

Hello! I was browsing GitHub, and came across this issue after curiously searching up "Grailsort".

I'm the manager of an open source project dedicated to researching, rewriting, and optimizing Grailsort. Our work is featured in our repo right over here: https://github.com/MusicTheorist/Rewritten-Grailsort

There's a JavaScript implementation inside the repo made by Enver, one of our contributors. Let us know if you have any questions!