title: How to implement a side menu that swipes from the left?
body: <p>I am new to Flutter and just finished the get started tutorial. I would like to create a side menu, which will appear from the left side when you swipe (like Gmail on Android). </p>
  
  <p>Unfortunately, I can't find such a layout on the documentation and the example from the flutter gallery is a bit messy.</p>
  
  <p>Could someone please explain me how to implement such a Widget?</p>