Switch vim colorscheme to gruvbox (#23)

.config/nvim/colors/Dark.vim

@@ -0,0 +1,63 @@
+
+"
+" Restore default colors
+hi clear
+set background=dark 
+
+
+if exists("syntax_on")
+  syntax reset
+endif
+
+let g:colors_name = "Dark"
+
+
+hi Normal guibg=grey20 guifg=GhostWhite
+hi NonText guibg=grey15 guifg=yellow3
+"hi Cursor guibg=GhostWhite
+"hi Cursor guibg=red guifg=white
+hi Cursor guibg=green2 guifg=black
+
+hi Statement  guifg=tan
+hi Constant   guifg=#FF7070
+hi String     guifg=#ffa0a0
+hi Comment    guifg=SkyBlue
+hi PreProc    guifg=orchid2
+hi Character  guifg=Cyan
+hi Type       guifg=orange   gui=none
+hi Special    guifg=#DDDD00
+hi Identifier guifg=#60DD60
+hi link Function Identifier
+"hi Function   guifg=#ffa0a0
+
+" Slight tweaks after some time away:
+hi Type guifg=LightMagenta
+hi PreProc guifg=orange2
+
+
+hi link SpecialKey Comment
+hi link Directory  Comment
+
+"
+" Colors not part of the original set:
+"
+"hi Folded guifg=cyan4 guibg=grey20
+hi Folded guifg=grey90 guibg=grey45
+hi Visual gui=reverse guibg=fg guifg=darkolivegreen
+hi Search guifg=black guibg=LightSkyBlue3 gui=none
+"hi IncSearch guifg=yellow guibg=LightSkyBlue3 gui=bold
+hi IncSearch guibg=blue guifg=yellow gui=bold
+hi WarningMsg guifg=red guibg=GhostWhite gui=bold
+hi Error guibg=red3
+
+
+" Here are the original colors:
+"hi guifg=grey70 gui=bold
+"hi guifg=#FF7070 gui=bold
+"hi guifg=green gui=bold
+"hi guifg=yellow gui=bold
+"hi guifg=SkyBlue gui=bold
+"hi guifg=orchid1 gui=bold
+"hi guifg=Cyan gui=bold
+"hi guifg=White gui=bold
+"