Add Delete Every Other Line as a vim til.

vim/delete-every-other-line.md

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+# Delete Every Other Line
+
+You can delete every other line in the current buffer using the following
+command.
+
+There is a fairly elegant way in vim to delete every other line in the
+current buffer. Why would you want to do that? I don't know. Nevertheless,
+here it is:
+
+```
+:g/^/+d
+```
+
+This will essentially delete all even numbered lines. If you'd like to
+delete all odd numbered lines, delete the first line in the file (`ggdd`)
+and then run the same command as above.
+
+This syntax is a bit awkward, so you may be better off going straight for a
+macro (e.g. `qqjddq5@q` or `qqddjq5@q`).
+
+[source](http://stackoverflow.com/questions/1946738/vim-how-to-delete-every-second-row)