Add Neovim integration details both to doc.txt and README.md

[fatih]

No description provided.

[shawnps]

+1 :) I am trying out neovim for the first time and I don't know what I'm doing.

[shawnps]

(and vim-go is the only thing I actually care about getting working)

[fatih]

@shawnps please check out the Issue #607, there you can find the necessary documentations for now. Actually there are not much to do, only if you want to change certain behaviors :)

[shawnps]

@fatih great, thanks! 👍

[nhooyr]

@fatih should I have a separate section for just neovim options or should I include them throughout and label them explicitly as neovim only?

[fatih]

@nhooyr My ideas was put a section in Readme.md, with short explanation of enhanced versions of our features. And after it populate each command in docs/vim-go.txt with a new paragraph, such as:

"If NeoVim is being used, :GoBuild runs asynchronously and doesn't block the UI. Errors are populated inside the location list. We provide a new function ... which you can plug into your statusline ..."