title: Howto combine TouchID <=> React Native <=> Amazon Cognito
body: <p>has somebody, who read this, experience with authentication using your thumb, 
   <strong>TouchID</strong>, in a <strong>React Native</strong> App, which uses <strong>Amazon Cognito</strong> as authentication service?</p>
  
  <p>I'm a newbie using React Native, and a real beginner using Cognito. Maybe someone knows a tutorial for this?</p>
  
  <p>Thx :-)</p>