refactor: Update VAST plugin in Artplayer

docs/assets/example/vast.js

@@ -1,3 +1,7 @@
+// Depends on: 
+// https://glomex.github.io/vast-ima-player/
+// https://developers.google.com/interactive-media-ads/docs/sdks/html5/client-side
+
 // npm i artplayer-plugin-vast
 // import artplayerPluginVast from 'artplayer-plugin-vast';
 
@@ -7,8 +11,11 @@ var art = new Artplayer({
     fullscreen: true,
     fullscreenWeb: true,
     plugins: [
-        artplayerPluginVast(({ playUrl }) => {
-            //
+        artplayerPluginVast(({ playUrl, imaPlayer, ima }) => {
+            // Play the ad when the video is played
+            art.once('play', () => {
+                playUrl('https://artplayer.org/assets/vast/linear-ad.xml');
+            });
         }),
     ],
 });