docs: add prioritizesVideoDevices example

Author: dylancom

README.md

@@ -27,6 +27,7 @@ import AirPlayButton from "react-native-airplay-button";
 <AirPlayButton 
   activeTintColor="blue"
   tintColor="red"
+  prioritizesVideoDevices={false}
   style={{ width: 30, height: 30 }}
 />
 ```

example/src/App.tsx

@@ -10,6 +10,7 @@ export default function App() {
       <AirPlayButton
         activeTintColor="blue"
         tintColor={systemRed}
+        prioritizesVideoDevices={false}
         style={styles.button}
       />
     </View>