Improve instructions on getting started

[amingilani]

As someone unfamiliar with nix, and trying to get this running. This has been incredibly frustrating.

I followed the instructions in the README and was met with:

[Error - 4:37:24 AM] Request textDocument/formatting failed.
Message: No formatter configured. Set the nil.formatting.command LSP server setting.
Code: -32603

I ensured that I had nil and direnv available, and went through several different configurations of trying to configure the command. They've all been met with:

[Error - 4:35:20 AM] Request textDocument/formatting failed.

I haven't been able to find a single configuration that works. I've through 8 different variations and even tried to copy the configuraitons other users posted in this repo, and others.

Please improve the README with specific instructions on getting started.

[Flameopathic]

Have you tried the configuration in the README? It's under LSP Plugin Support > Advanced Settings. That's the config that I use and it only gives me the error you're talking about if I have a syntax error. I don't know enough about the codebase if you've tried that and it doesn't work.