Librarian Bot: Add language metadata for dataset (#1)

- Librarian Bot: Add language metadata for dataset (e79dcf5928ef86a2f8396be45423131cff36fb3d)


Co-authored-by: Librarian Bot (Bot) <[email protected]>

README.md

@@ -1,4 +1,6 @@
 ---
+language:
+- ja
 dataset_info:
   features:
   - name: instruction_id