Librarian Bot: Add language metadata for dataset (#2)

- Librarian Bot: Add language metadata for dataset (f96c79ee4b4f534bd3d7033e0db3aff0a1a0952c)


Co-authored-by: Librarian Bot (Bot) <librarian-bot@users.noreply.huggingface.co>

README.md

@@ -1,4 +1,6 @@
 ---
+language:
+- en
 dataset_info:
   features:
   - name: pubid