R1:17fe8511d794

Add Comments to Countdown

Summary: 3, 2, 1, Liftoff! (Adds basic commenting to countdown)

Test Plan: asdf asdf asdf

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T8895

Differential Revision: https://secure.phabricator.com/D13707