Add link to split keyboard comparison tool

[jhelvy]

Hi,

I built this tool for comparing different split keyboard layouts (source code here). I figured this would be a good place to include a link to it. I wasn't sure where on the main readme it should go so I'm just mentioning it here.

Cheers,
John

[kissu]

Great tool ! 👌🏻

[eldelacajita]

That's cool!

If you added a scaling slider, you could even match the size on screen to the real size, using the scale you added below the images, and a ruler.

[jhelvy]

I think that actually wouldn't be that hard to implement, but the "print" button will already print the overlays to a PDF that will print to correct scale.

[pvinis]

I think you should definitely add this here. Maybe make a PR? :)

[jhelvy]

Just made a PR. I also added a table of contents at the top so that it's easier to jump to the content near the bottom of the readme.

[abowen]

Are PR's even merged anymore?
The Lily58 has been there for a long time

[pvinis]

Indeed. Maybe @diimdeep could add someone else too as maintainer to help with this?