Add introduction youtube video

Author: tachyons

docs/chapter3/1introduction.md

@@ -2,7 +2,5 @@
 
 The CircuitVerse simulator includes different sections for building and managing circuit simulations. Watch the below video for a quick demonstration of how you can build and simulate your circuits using different features and workflows available within the CV platform.
 <div>
-<iframe>
-[Make your First Circuit within CV_Video]
-</iframe>
+<iframe width="1424" height="592" src="https://www.youtube.com/embed/F-_uvYJK938" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
 </div>