Add Set Your Color Scheme as a vim til.

vim/set-your-color-scheme.md

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+# Set Your Color Scheme
+
+Vim ships with a number of standard color schemes for both light and dark
+backgrounds. You can also find and install many others. To set your color
+scheme, you can use the `:colorscheme` command. You can quickly see what
+color schemes are available by typing `:colorscheme` and then tabbing for
+completion. For instance, you can set the *delek* color scheme by entering
+
+```
+:colorscheme delek
+```
+
+See `:h colorscheme` for more details.