Ruby bindings

[kojix2]

Hi! @LTLA

I created a Ruby wrapper for Umappp.
It doesn't work exactly the same as yaumap, so I may have made a mistake somewhere, but basically it appears to be working well.

https://github.com/kojix2/umap

Have a nice day!

[Aaron Lun]

This is very neat. My Ruby knowledge is pretty basic but it looks cool.

I wouldn't worry about the differences, I don't get exactly the same results as uwot either. Probably something to do with numerical imprecision, compiler settings, etc. Doesn't really matter in the big picture.