title: How to add "click" listener on marker in mapbox-gl-js
body: <p>I added few markers on the map using folowing this example:</p>
  
  <p><a href="https://www.mapbox.com/mapbox-gl-js/example/geojson-markers/" rel="noreferrer">https://www.mapbox.com/mapbox-gl-js/example/geojson-markers/</a></p>
  
  <p>Now I want to show popup when user clicks on marker image, but i can not find elegant solution. Any help?</p>