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

- Librarian Bot: Add language metadata for dataset (9bfa8b6e5b8bf67ce8785c5937bda10d3ef4f147)


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

README.md

@@ -1,4 +1,6 @@
 ---
+language:
+- en
 license: apache-2.0
 ---
 # Synthetic IR Dataset