Update README.md

Author: OpenAstroTech

README.md

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 # The OpenAstroTracker:
-![ ](https://i.imgur.com/qGr2bFf.jpg)
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+<iframe width="768" height="432" src="https://www.youtube.com/embed/9MNLAIyqGoA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
 
 A cheap 3D printed tracking, GoTo and autoguiding mount for DSLR astrophotography.