Create SSH connection to Raspberry Pi headless

# Create empty file called ssh  (no file extension)
touch ssh
# Create wpa_supplicant.conf file
touch wpa_supplicant.conf
# Insert following into wpa_supplicant.conf
country=DK
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
scan_ssid=1
ssid="your_wifi_ssid"
psk="your_wifi_password"
}