I've created an eagle library for the $15 Hi-Link HLK-RM04 wifi module. All pins are named and numbered. The only thing you need to look out for is the 2mm pin spacing. Typical protoboard spacing is 2.54mm, so you will likely need to make a breakout board for this module. I'm preparing a follow-up post with details on how to init this module and connect to a secured WPA2 network.