Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/adam.vim

@@ -0,0 +1,48 @@
+" local syntax file - set colors on a per-machine basis:
+" vim: tw=0 ts=4 sw=4
+" Vim color file
+"
+" Based on an original vim color file by
+" Ron Aaron <ron@mossbayeng.com> (2001 Jul 28)
+" 
+" Maintainer:	Adam Krouskop
+" Last Change:	2003 Jul 3
+
+
+set background=light
+hi clear
+if exists("syntax_on")
+  syntax reset
+endif
+let g:colors_name = "adam"
+hi Normal		guifg=#008844	guibg=#002244
+hi NonText		guifg=brown
+hi comment		guifg=#D80033
+hi constant		guifg=#CCCCCC
+hi identifier	guifg=#0033FF gui=NONE
+hi statement	guifg=white	gui=NONE
+hi preproc		guifg=#009999
+hi type			guifg=#0033FF gui=NONE
+hi special		guifg=#FFFF00 gui=NONE
+hi ErrorMsg		guifg=Black	guibg=Red
+hi WarningMsg	guifg=Black	guibg=Green
+hi Error		guibg=Red
+hi Todo			guifg=Black	guibg=orange
+hi Cursor		guibg=#ffffff guifg=#cac2ff
+hi Search		guibg=#103F5F gui=bold
+hi IncSearch	gui=bold guibg=#285f7f
+hi LineNr		guifg=darkgrey
+hi title		guifg=darkgrey
+hi StatusLineNC	gui=NONE guifg=lightblue guibg=darkblue
+hi StatusLine	gui=bold	guifg=cyan	guibg=blue
+hi label		guifg=gold2
+hi operator		guifg=orange
+hi clear Visual
+hi Visual		term=reverse cterm=reverse gui=reverse
+hi DiffChange   guibg=darkgreen
+hi DiffText		guibg=olivedrab
+hi DiffAdd		guibg=slateblue
+hi DiffDelete   guibg=coral
+hi Folded		guibg=gray30
+hi FoldColumn	guibg=gray30 guifg=white
+hi cIf0			guifg=gray