Add CLI output explaining how to add yourself to the list

[feross]

Saw a great recommendation from @iarna on the package.community Discord channel which I just joined.

Decentralized contribution info or no, I'd like npx thanks to point folks where to learn about how to add themselves. So it's less of a "cool kids" thing

Totally agree. I was planning to add this but forgot to do it.

[akcokakcok]

Thanks