Added video resource(Youtube video) for event loop. (#2286)

* Added video resource(youtube) for event loop.

* Update content/roadmaps/106-javascript/content/112-javascript-asynchronous-javascript/100-event-loop.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/106-javascript/content/112-javascript-asynchronous-javascript/100-event-loop.md

@@ -4,3 +4,4 @@ The Event Loop is one of the most important aspects to understand about Node.js.
 
 <BadgeLink colorScheme="yellow" badgeText="Read" href="https://nodejs.dev/en/learn/the-nodejs-event-loop/">The Node.Js Event Loop</BadgeLink>
 <BadgeLink colorScheme="yellow" badgeText="Read" href="https://dev.to/lydiahallie/javascript-visualized-event-loop-3dif">JavaScript Visualized: Event Loop</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=8aGhZQkoFbQ'>What the heck is the event loop anyway?</BadgeLink>