docs: add Zed configuration

[BaptisteRoseau]

I created a plugin using this LSP to work with the Zed editor.

Here is the documentation on how to use it, and to add Zed to the list of IDE already using your LSP.

[tekumara]

This is cool and I can add this, if you are happy to provide support for the extension?

[BaptisteRoseau]

@tekumara Sure, I will. You won't need to worry about the Zed extension :D

[tekumara]

Great, thank you for the contribution!