`treehouses tg-terminal` (fixes #1778)

[darthnoward]

fixes #1778

what does it do?

serves as a terminal over on Telegram send commands to a Telegram bot and get the output.

easy to access your rpi even if you're on a phone!

how to test it?

• apply for a Telegram account if you don't have one and install Telegram client for mobile/desktop
• create a Telegram bot and get the token for it, see this link for help, the format of the token would be similar to 110201543:AAHdqTcvCH1vGWJxfSeofSAs0K5PALDsaw
• run treehouses upgrade cli tg-terminal to switch to this branch
• run treehouses tg-terminal install [put the token here] to install
• run treehouses tg-terminal start to start it
• Text your Bot on Telegram "/start", then enter the password treehouses when prompted
• Text your Bot on Telegram "/run"

Terminal over on Telegram is now working!!

what's more to test on?

• treehouses tg-terminal install [token] [password] to set a custom password instead of default treehouses
• treehouses tg-terminal enable to make the bot run automatically on boot, so the bot will be operational even after you reboot
• drag and drop for file transfer to rpi