Add dataset card documenting merge sources

README.md

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+---
+license: apache-2.0
+task_categories:
+- robotics
+tags:
+- LeRobot
+- ur3
+---
+
+# UR3 Multi-Task Dataset
+
+Merged from the following 5 LeRobot v2.1 datasets:
+
+| # | Source | Task |
+|---|--------|------|
+| 0 | [poweredshine/ur3-pot-lid-closing](https://huggingface.co/datasets/poweredshine/ur3-pot-lid-closing) | close the pot by placing the lid |
+| 1 | [poweredshine/ur3-pot-lid-opening](https://huggingface.co/datasets/poweredshine/ur3-pot-lid-opening) | open the pot by removing its lid |
+| 2 | [poweredshine/ur3-remove-cup-from-nested-cups](https://huggingface.co/datasets/poweredshine/ur3-remove-cup-from-nested-cups) | Remove cup from nested cups |
+| 3 | [poweredshine/ur3-single-finger-pushing-glass-to-marker](https://huggingface.co/datasets/poweredshine/ur3-single-finger-pushing-glass-to-marker) | Single-finger push to blue marker |
+| 4 | [poweredshine/ur3-white-class-on-coaster](https://huggingface.co/datasets/poweredshine/ur3-white-class-on-coaster) | pick up the white glass and put on a brown coaster |
+
+See `meta/tasks.jsonl` for exact task strings.
+
+Built with `merge_datasets_v21.py`, post-processed with `fix_merged_counts.py`.