title: Image logo should maintain a size relative to the device screen size
body: <p>I have a basic Layout question.</p>
  
  <p>When using the layout tab (rather than the coding tab) in my main.xml, I am trying to create a home screen for when my app opens.</p>
  
  <p>There is going to be the logo at the top center, then 3 simple buttons below, all centered.</p>
  
  <p>How do I go about formatting the Logo so it maintains a size relative to the person's screen size, and stays in the center?</p>
  
  <p>I don't want to write sloppy code to where my program looks fine (UI wise) on my screen and is poorly formatted on other's screens.</p>
  
  <p>Also, is there good documentation explaining all of the Property values in the layout view?</p>