VIM: Add my prefered colourscheme: gruvbox and set leaders

This involved adding a submodule which contains the gruvbox plugin.

Normally I have the background transparent when using vim but I am going
to try without that.

I have set my leader key to space and my local leader to \ which I am
used to

.gitmodules

@@ -19,3 +19,6 @@
 [submodule "shells/zsh/plugins/git-fuzzy"]
 	path = shells/zsh/plugins/git-fuzzy
 	url = https://github.com/bigH/git-fuzzy
+[submodule "nvim/.config/nvim/pack/opt/gruvbox"]
+	path = nvim/.config/nvim/pack/bundle/opt/gruvbox
+	url = https://github.com/morhetz/gruvbox.git

nvim/.config/nvim/init.vim

@@ -0,0 +1,2 @@
+let mapleader = "\<Space>"
+let maplocalleader = "\\"

nvim/.config/nvim/pack/bundle/opt/gruvbox

@@ -0,0 +1 @@
+Subproject commit bf2885a95efdad7bd5e4794dd0213917770d79b7

nvim/.config/nvim/plugin/plugins.vim

@@ -0,0 +1,3 @@
+if has('packages')
+	packadd! gruvbox
+endif

nvim/.config/nvim/plugin/settings.vim

@@ -0,0 +1,4 @@
+let g:gruvbox_italic=1
+set termguicolors
+colorscheme gruvbox
+