Updated readme to include Software Testing Tutorial playlist (#24)

* updated readme with youtube playlist

* updated h3 for youtube playlist

Author: mfaisalkhatri

README.md

@@ -42,11 +42,11 @@ It is always a tedious and boring task to write test cases, which takes most of
 
 ## :movie_camera: Tutorial Video
 
-:pushpin: Playlist of Software Testing Tutorial Videos :point_down:
-<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/videoseries?si=yllnGdqnIOjvKn-e&amp;list=PLMer2TvhZIw-Qhz82h0BvWWemgO-PQQaN" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+### :pushpin: Playlist of Software Testing Tutorial Videos :point_down:
+[![Watch the video](https://img.youtube.com/vi/6LcKSCiOFSo/hqdefault.jpg)](https://youtube.com/playlist?list=PLMer2TvhZIw-Qhz82h0BvWWemgO-PQQaN&si=JDe4mIbEa34eCKil)
 
-:pushpin: Playlist of Software Testing Interview Preparation Videos :point_down:
-<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/videoseries?si=KiMl5hM55CiGV9Ey&amp;list=PLMer2TvhZIw9WWVaZM80epFfZ9aErSGHZ" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+### :pushpin: Playlist of Software Testing Interview Preparation Videos :point_down:
+[![Watch the video](https://img.youtube.com/vi/AvGsez6TS4g/hqdefault.jpg)](https://youtube.com/playlist?list=PLMer2TvhZIw9WWVaZM80epFfZ9aErSGHZ&si=8Cgyrf5uDLqLBopz)
 
 
 ## Recommended Proxies