Update README.md

README.md

@@ -12,4 +12,7 @@ datasets:
 
 ![OO-FLAN Logo](https://huggingface.co/datasets/Open-Orca/FLAN/resolve/main/OOFlanLogo.png "OO-FLAN Logo")
 
-# FLAN Collection
+# FLAN Collection
+
+* JSON files at top level are used for subsampling in OpenOrca
+* Parquets in subdirectories contain the entire FLAN collection in Dask-sharded folders by submix fractions