Do your first code review

[seanh]

In this phase of your onboarding you'll start reviewing pull requests (PRs) from other developers.
Your buddy will help you identify some good first PRs to review.

• Buddy: identify some good first PRs and assign them to the new engineer to review.

• Engineer: re-read our Engineering Values.
  They describe the kinds of PRs that we want and how we want you to approach code review.

• Engineer: read our code review guidelines.
  These go into more detail about how we do code review.

• Engineer: check out the pull request branch locally and test it.
  The PR should contain testing instructions. If not, you can request them from the PR's author.

• Engineer: check off this item once you've approved your first PR.
  In most cases, it is the author's responsibility to merge and deploy a PR once it has been approved.