Add display-password.py plugin to show most recently cracked password on Pwnagotchi's face

[c-nagy]

Displays the most recently cracked password on the Pwnagotchi display. It currently processes the potfile generated by the Pwnagotchi wpa-sec.py plugin.

My post on the subreddit about this plugin (with screenshot) was well-received so thought it would be worth trying to get it merged into the plugins repo. Thanks @evilsocket for the fun and educational project. ​

[jLynx]

This is a really nice plugin you have created here, good job 👍