Add neovim config using nixvim

programs/nixvim/options.nix

@@ -0,0 +1,36 @@
+{ pkgs, ... }:
+
+{
+  programs.nixvim = {
+
+    clipboard = {
+      register = "unnamedplus";
+    };
+
+    opts = {
+      backup = false;
+      breakindent = true;
+      expandtab = true;
+      hlsearch = true;
+      incsearch = true;
+      mouse = "a";
+      number = true;
+      relativenumber = true;
+      scrolloff = 8;
+      shiftwidth = 2;
+      signcolumn = "yes";
+      smartindent = true;
+      swapfile = false;
+      tabstop = 2;
+      termguicolors = true;
+      undofile = true;
+      updatetime = 250;
+      wrap = false;
+    };
+
+    globals = {
+      mapleader = " ";
+      maplocalleader = " ";
+    };
+  };
+}