Update README.md

added link to the presentation slides

Author: rlnav

README.md

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 Self-supervised learning of physics-aware grey-box model for predicting robot-terrain interaction.
 
 [![Arxiv](http://img.shields.io/badge/paper-arxiv.2303.01123-critical.svg?style=plastic)](https://arxiv.org/abs/2309.09007)
+[![Slides](http://img.shields.io/badge/presentation-slides-blue.svg?style=plastic)](https://docs.google.com/presentation/d/1pJFHBYVeOULi-w19_mLEbDTqvvk6klcVrrYc796-2Hw/edit?usp=sharing)
 
 <img src="docs/imgs/overview_from_img.png" height="280"/> <img src="docs/imgs/overview.png" height="300"/>