Add paper recommendation comment feature to format_comment function

app.py

@@ -91,6 +91,7 @@ def format_comment(result: str):
     )
     result += "\n\n Please give a thumbs up to this comment if you found it helpful!"
     result += "\n\n If you want recommendations for any Paper on Hugging Face checkout [this](https://huggingface.co/spaces/librarian-bots/recommend_similar_papers) Space"
+    result += "\n\n You can directly ask Librarian Bot for paper recommendations by tagging it in a comment: `@librarian-bot recommend`"
     return result