Add metadata.json

metadata.json

@@ -0,0 +1,15 @@
+{
+  "READY": true,
+  "name": "QM9_gap",
+  "task": "regression",
+  "cat_idx": [],
+  "num_samples": 131970,
+  "num_features": 841,
+  "description": "Task (column name) 'gap' of the QM9 dataset.",
+  "source": "MoleculeNet",
+  "label": "drug discovery",
+  "sub_labels": [
+    "Quantum Mechanics",
+    "Coulomb Matrix"
+  ]
+}