Summary: Ref T4398. I found a reasonable-ish LGPLv3 library for doing this, which isn't too huge or unwieldy.
Test Plan:
- Scanned QR code with Authy.
- Scanned QR code with Google Authenticator.
{F149317}
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4398
Differential Revision: https://secure.phabricator.com/D8923
