Update README.md

Update readme with arxiv ref.

README.md

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 # Robotics Bowel Retraction Dataset
 
-Dataset release for **Supervised Mixture-of-Experts for Surgical Grasping and Retraction**.
+Dataset release for **Supervised Mixture-of-Experts for Surgical Grasping and Retraction**, arxiv.org/abs/2601.21971.
 
 This dataset supports learning autonomous surgical-assistant policies for collaborative bowel grasping and retraction. In each demonstration, a surgeon-controlled instrument visually indicates a target bowel segment and the robot assistant performs grasping, retraction, and tension maintenance using stereo endoscopic observations.