Update README.md (#3)

- Update README.md (db666e8b8a1bfa49b504b67818bf6582a5deb858)


Co-authored-by: Blake S <bsnelling@users.noreply.huggingface.co>

README.md

@@ -168,4 +168,7 @@ Daniel Zügner (dzuegner@microsoft.com)
 ## Model Card Contact
 
 Daniel Zügner (dzuegner@microsoft.com)
-Tian Xie (tianxie@microsoft.com)
+Tian Xie (tianxie@microsoft.com)
+
+## Data Summary
+https://huggingface.co/microsoft/mattergen/blob/main/data_summary_card.md