Surface.js

if (app.hasSurfaceCapability(app.SurfaceCapabilities.SCREEN_OUTPUT)) {
  return app.ask(app.buildRichResponse()
    .addSimpleResponse('The ' + input + ' chord can be played like this. ' + strings.general.whatNext)
    .addBasicCard(app.buildBasicCard(buildString(chord))
      .setTitle('The ' + input + ' chord')
      .setImage('https://github.com/hitherejoe/Fret/blob/master/functions/images/' + input + '.png?raw=true', 'The ' + input + ' chord')));
}