Document creating Gmail "app password" for Blink1Control2

[todbot]

Not sure where in the Help to put this. But the doc & process is essentially:

If you have two-factor authentication on your Google account (and you really should), you need to create an "app password" for Blink1Control2 to access your Gmail. This is good because then Blink1Control2 doesn't know your real password and you can revoke this app password whenever you want.

To create an app password:

1. Log into your Gmail account normally in your browser
2. Visit https://myaccount.google.com/u/1/security
3. Under "Signing into Google" click on "App Password" section
4. Under "Apps with access to your account" click on "MANAGE APPS"
5. Under "Select the app and device you want to generate the app password for." Select app "MAIL" and select device "Custom" and give it the name "Blink1Control2" (the name isn't important, it's just for your reference)
6. Click "GENERATE"
7. Use the resulting password as the IMAP/Gmail password in Blink1Control2, with your gmail address being the username.