Add README with per-config metadata

README.md

@@ -41,6 +41,14 @@ erroneous step) and an image, select the option that correctly completes the tas
 
 ```python
 from datasets import load_dataset
+
 ds = load_dataset("shrg7/COSPLAN", "blocksworld", split="test")
-print(ds[0]["prompt"], ds[0]["correct_option"])
+
+row = ds[0]
+print(row["prompt"], row["correct_option"])
+
+# The image is decoded as a PIL.Image under the "image" column
+img = row["image"]
+print(img.size, img.mode)
+img.save("example.png")   # or img.show()
 ```