Add syntax files from upstream vim repository

syntax/whitespace.vim

@@ -0,0 +1,17 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
+  
+" Simplistic way to make spaces and Tabs visible
+
+" This can be added to an already active syntax.
+
+syn match Space " "
+syn match Tab "\t"
+if &background == "dark"
+  hi def Space ctermbg=darkred guibg=#500000
+  hi def Tab ctermbg=darkgreen guibg=#003000
+else
+  hi def Space ctermbg=lightred guibg=#ffd0d0
+  hi def Tab ctermbg=lightgreen guibg=#d0ffd0
+endif
+
+endif