Add alaviss/nim.nvim

Editor-Support.md

@@ -39,6 +39,17 @@ The following editors have some Nim support:
 
   A very new plugin for Vim and Neovim, still in heavy development.
 
+* https://github.com/alaviss/nim.nvim
+
+  An experimental plugin targeting Neovim (no Vim support) featuring:
+
+  * Semantic syntax highlighting
+  * Go to definition
+  * Auto-completion
+  * Section movements
+  * Auto-indent
+  * Code folding
+
 * http://gradha.github.io/articles/2014/02/invoking-dash-from-the-command-line-vim.html
 
   Instructions to map Vim's ``K`` letter to look up documentation under MacOSX using [Dash](http://forum.nim-lang.org/t/330).