Update README.md

Updated video reference.

README.md

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 **Roomberry** is a surveillance robot based on **Roomba** using a **Raspberry Pi Zero W** and a **camera module**. A demo of Roomberry's capabilities as well as the web interface developed to interact with the robot can be seen in the following video:
 
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+[![Roomberry Demo](https://domoticproject.com/wp-content/uploads/2018/08/RoomberryDemoVisualCue.png)](https://www.youtube.com/watch?&v=kQcQSE5pvNA "Roomberry Demo")
 
 ## Requirements