Info for hidden wifi network & wpa_supplicant.conf

docs/docs/walkthrough/phase-0/setup-edison.md

@@ -170,6 +170,8 @@ network={
 }
 ```
 
+If you have a hidden wifi network add the line `scan_ssid=1`.
+
 Press Esc and then type ':wq' and press Enter to write the file and quit
 
 Run `ifup wlan0` to make sure you can connect to wifi
@@ -181,6 +183,7 @@ If you need more details on setting up wpa_supplicant.conf, see one of these gui
 * [http://weworkweplay.com/play/automatically-connect-a-raspberry-pi-to-a-wifi-network/](http://weworkweplay.com/play/automatically-connect-a-raspberry-pi-to-a-wifi-network/)
 * [http://www.geeked.info/raspberry-pi-add-multiple-wifi-access-points/](http://www.geeked.info/raspberry-pi-add-multiple-wifi-access-points/)
 * [http://raspberrypi.stackexchange.com/questions/11631/how-to-setup-multiple-wifi-networks](http://raspberrypi.stackexchange.com/questions/11631/how-to-setup-multiple-wifi-networks)
+* [http://www.cs.upc.edu/lclsi/Manuales/wireless/files/wpa_supplicant.conf](http://www.cs.upc.edu/lclsi/Manuales/wireless/files/wpa_supplicant.conf)
 
 
 ## Install packages, ssh keys, and other settings