title: How to use RCTRootView in a view controller?
body: <p>I am working on react native iOS app(demo). And new to the react native. I want to know about the <code>RCTRootView</code> i.e how it is work. And I have a doubt i.e. in the <code>app delegate</code> the root view is created default. If I added another root view in my <code>view controller</code> what happens? And it set which one will be the root view.Can anyone help me on this? And what happens if I create it with the new module name?</p>
  
  <p>Thanks in advance...</p>