title: geolocation game event on marker approach
body: <p>I need some information, I wan't to create a simple game with a geolocation API, I have looked at: Google Map API, MapBox.</p>
  
  <p>I wan't to have the actual location of the user, he can see the map around him (like Pokemon GO), I can put a marker at 10 meters for example, when he approach the marker with his phone, I do an event, a popup appear, and he won a score is increased. </p>
  
  <p>How can I do that ?</p>