title: react-native landscape mode Orientation
body: <p>Im still beginner and here is one page that I want it to display with landscape mode when I open up the page. I installed react-native-orientation, but im not sure how I can use this.</p>
  
  <p>I want landscape mode when I open the app, so I believe that I should set Orientation when I use, <code>componentWillMount(){
      Orientation
    }
  </code></p>
  
  <p>but im not sure how to set it up... could anyone tell me how?</p>