Loading: add the lerobot[dataset] install step

README.md

@@ -66,7 +66,13 @@ Each folder holds one episode. Three more tasks (connect four, jenga and a puzzl
 
 ## Loading
 
-Each task folder is its own LeRobot dataset. Download one folder and point LeRobot at it:
+Each task folder is its own LeRobot dataset. Install LeRobot with its dataset extra (tested with lerobot 0.6.1):
+
+```bash
+pip install "lerobot[dataset]"
+```
+
+Then download one folder and point LeRobot at it:
 
 ```python
 from huggingface_hub import snapshot_download