touch /Volumes/boot/ssh
vim /Volumes/boot/wpa_supplicant.conf

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=US

network={
	ssid="Your network SSID"
	psk="Your WPA/WPA2 security key"
	key_mgmt=WPA-PSK
}