Update README.md

Author: geekjr

README.md

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 ## QuickAI is a Python library that makes it extremely easy to experiment with state-of-the-art Machine Learning models.
 
 Announcement video
-https://www.youtube.com/watch?v=kK46sJphjIs
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+[![Announcement video](https://img.youtube.com/vi/kK46sJphjIs/0.jpg)](https://www.youtube.com/watch?v=kK46sJphjIs)
 
 Demo https://deepnote.com/project/QuickAI-1r_4zvlyQMa2USJrIvB-kA/%2Fnotebook.ipynb