Add link to paper, add task category

This PR ensures that the dataset card is linked to (and can be found at) https://huggingface.co/papers/2503.07111 and is appropriately tagged under `task_categories`.

README.md

@@ -21,5 +21,8 @@ configs:
     path: data/train-*
   - split: test
     path: data/test-*
+task_categories:
+- robotics
 ---
-- arxiv.org/abs/2503.07111
+
+This dataset is used in the paper [PoseLess: Depth-Free Vision-to-Joint Control via Direct Image Mapping with VLM](https://huggingface.co/papers/2503.07111)