title: how to get current user on firebase
body: <p>I would like to know how how to get the current user.  I am making a function where the user is creating a group and would like to add the user making the group to it at the same time.  I can make the group fine, that was simple enough.  But I do not know how to get to the user object outside of the simple login object.</p>
  
  <p>I'm sorry if there are several topics stating this already, but I have been looking for hours and have not been able to find anything that explains it.  Any help would be appreciated.</p>