docs: List projects that use node-client in README.md

[snoblenet]

It would be handy to see a list of projects that use node-client in README.md

[justinmk]

https://github.com/vscode-neovim/vscode-neovim is a major one. Not sure about others.

Pinned this issue, hoping others will be mentioned.

[mikavilpas]

I'm using this project in https://github.com/mikavilpas/tui-sandbox to run end-to-end tests.

It mostly works really well, but there may be some rough edges.