dataset card: add notes

README.md

@@ -209,4 +209,9 @@ This dataset was created using [LeRobot](https://github.com/huggingface/lerobot)
 
 ```bibtex
 [More Information Needed]
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+```
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+## Notes
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+
+Go2 EDU hallway walking, DualSense teleop (max 1.2 m/s). RGB + depth (mm, lossless HEVC), observation.state=[vx,vy,vyaw,roll,pitch,body_height,move], observation.pad=[lx,ly,rx,ry], observation.move=[move] (1 while the left stick commanded vx/vy, 0 when released), action=[vx,vy,vyaw] sport-mode Move command. 25 episodes as of 2026-09-10 (collection ongoing, target 50).