So you got the RPi Zero or one of the A’s without an ethernet port. Apparently its pretty easy to add one with $5 in parts. This doesn’t make much sense with an A (its only $5 more for a B with it built in). But with the Zero being only $5, I can see adding this in.
http://www.instructables.com/id/Super-Cheap-Ethernet-for-the-Raspberry-Pi/