Add ClearML Reports video (#439)

docs/webapp/webapp_reports.md

@@ -2,6 +2,18 @@
 title: Reports
 ---
 
+<div style={{position: 'relative', overflow: 'hidden', width: '100%', paddingTop: '56.25%' }} >
+<iframe style={{position: 'absolute', top: '0', left: '0', bottom: '0', right: '0', width: '100%', height: '100%'}} 
+        src="https://www.youtube.com/embed/D6fCvpmV8eo" 
+        title="YouTube video player" 
+        frameborder="0" 
+        allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; fullscreen" 
+        allowfullscreen>
+</iframe>
+</div>
+
+<br/>
+
 With ClearML’s Reports you can write up notes, experiment findings, or really anything you want. You can create reports 
 in any of your ClearML projects.