Update README.md

add tiny train configuration

README.md

@@ -7,6 +7,8 @@ configs:
         path: iupac_smiles_train.csv
       - split: test
         path: iupac_smiles_test.csv
+      - split: tiny_train
+        path: iupac_smiles_tiny_train.csv
       - split: small_test
         path: iupac_smiles_smalltest.csv
 ---