title: Checking if caps lock is on in react-native
body: <p>Currently, I only use Android's</p>
  
  <pre><code>event.isCapsLockOn(){}
  </code></pre>
  
  <p>to check if caps lock is on and then prompt the user if it is.</p>
  
  <p>Is there a built in prop/command in react native to do this, so I can do both in Android and iOS?</p>