title: No Navigation Editor in android studio
body: <p>I'm trying to work on this new navigation editor introduced as a part of architecture components recently.</p>
  
  <p>reference : <a href="https://youtu.be/8GCXtCjtg40?t=311" rel="nofollow noreferrer">https://youtu.be/8GCXtCjtg40?t=311</a></p>
  
  <p>I added the depdencies as mentioned in the documentation
  <a href="https://developer.android.com/topic/libraries/architecture/adding-components#navigation" rel="nofollow noreferrer">https://developer.android.com/topic/libraries/architecture/adding-components#navigation</a></p>
  
  <p>My assumption is that there is a new 'Resource Type' called 'Navigation' introduced. And when I add a 'Navigation' file in my project, android studio will let me view that file in two modes, text and design and I thought that the design mode is the 'Navigation Editor'</p>
  
  <p>I tried what was given in the documentation.
  <a href="https://developer.android.com/topic/libraries/architecture/navigation/navigation-implementing" rel="nofollow noreferrer">https://developer.android.com/topic/libraries/architecture/navigation/navigation-implementing</a>
  Right click the 'res' folder -> new resource file -> resouce type - 'Navigation'.  But, I could not find a resouce type called 'Navigation'</p>
  
  <p>However I was able to create a resource directory of type 'Navigation' and add a xml file in the directory but android studio did not have a design mode for the file.</p>
  
  <p>Why Im I not seeing this 'Navigation' resource type ? </p>