Update README.md

README.md

@@ -1,2 +1,18 @@
 Trajectories for the fruit box game (play [here](https://en.gamesaien.com/game/fruit_box/)). An agent (scripted policy) repeatedly selects axis-aligned rectangles on a fixed 10×17 board of digits 1...9 so that the sum over the rectangle equals 10. Selected cells are cleared (set to 0). There is no gravity and no refill.
-Reward per step = number of non-zero cells cleared. Episodes end when no legal move remains.
+Reward per step = number of non-zero cells cleared. Episodes end when no legal move remains.
+
+Data is formatted as follows:
+```
+{
+  episode_id: string,
+  step: int,
+  grid: Arr[10][17],
+  action: {"c1": int, "c2": int, "r1": int, "r2": int},
+  num_legal_actions: int,
+  legal: bool,
+  reward: int,
+  done: bool,
+  agent_tag: string,
+  rng_seed: 1
+}
+```