Add Toggling Syntax Highlighting as a vim til

vim/toggling-syntax-highlighting.md

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+# Toggling Syntax Highlighting
+
+Syntax highlighting in Vim is generally a good thing, but sometimes you need
+to turn it off. This can be achieved with the `syntax` command.
+
+```vim
+:syntax off
+```
+
+When you need that syntax highlighting back again, you can turn it right
+back on like so:
+
+```vim
+:syntax on
+```
+
+See `:h syntax-on` for more details.
+
+h/t Steve Klabnik