title: Adding a button to the title bar Xamarin Forms
body: <p>Haven't been able to find quite the right answer for this yet. I want to add a button into the navigation / title bar at the top of a Xamarin Forms Navigation Page. Note that I need to know a method that will work on android, I'm not interested in trying to find an iOS only solution here. This button needs to be an image button as I want a way to access a hamburger menu.</p>