title: How to set specifict users to be reviewers
body: <p>I am using Visual Studio 2015 and git. I have a branch policy where pull requests have to be approved by at least one user (reviewer) before merge.</p>
  
  <p>But I don't want every user to be a reviewer, I would like to set up a group of users or specific ones that can be reviewers. Is there a way to do this?</p>