title: Sign in with Firebase-Admin using node.js
body: <p>I am trying to sign in with node.js with firebase-admin, but when I look up there API, they only have sections on <code>update</code>, <code>delete</code> and <code>create</code>. </p>
  
  <p>They do have sections on how to get the user by email but if i want to sign in a user should I not be verifying also by their password as well. I feel like I am incorrectly reading how to use firebase-admin. My best guess is that I should be using straight Firebase and not the new firebase-admin.</p>
  
  <p><em>Edit:</em></p>
  
  <p>I only want to sign in the user by email (i.e. not by google sign in or facebook login), if that is possible.</p>