Add an alarm when cards are unlocked (with ability to turn off as well)#32

Add a notification setting (ie alarm) that can be turned on/off (only with active key or password) that would notify us when we have a card being “unlocked”. So if we unlock our own cards, then we can either a) ignore the warning message (eg…YOU HAVE CARDS BEING UNLOCKED) or b) we can just go to our settings and turn it off.

This would be an additional benefit of putting notifications like what I just suggested. Please see this link https://feedback.splinterlands.com/102