Changes

This is a metal case specially designed for [http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-3B.html Orange Pi 3B], we name it as the model is N510. It reserves all the interfaces of the Orange Pi 3B motherboard, supports the 3010 5v cooling fan installation, supports the extraction of the GPIO cable, and also reserves holes for you to facilitate the installation of external antenna and build-in antenna.