The table layout and example formatting of "The Universal Route Module API Specification" is quite good: https://github.com/fastify/fastify-dx/blob/main/URMA.md

Table layouts are cool on desktop, but they suck on mobile.

The link above, after switching to desktop mode on Chrome on Android looks fine.

This one is pretty neat:

https://github.com/esatterwhite

It's not an app README, but a profile one. A lot of it is done with images.

Vimspector