Add 4x videos to L15

Author: iHiD

bootcamp_content/levels/15.md

@@ -4,4 +4,13 @@ Welcome to Level 15, where we finally start putting all the pieces together. In
 
 Your exercises this week start getting you working with HTML, CSS and JS combined. There's a couple of tricky exercises, but break them into pieces and you'll get there!
 
+## Important: Four videos this week!
+
+There are four videos this week:
+
+- [Teaching Session](https://youtube.com/live/abOBYUU6ebU)
+- [Labs 1](https://youtube.com/live/ECKGme_2d1k)
+- [Labs 2](https://youtube.com/live/W9TdczZymjk)
+- [Labs 3](https://youtube.com/live/35J6KczCYgw)
+
 Good luck!