fine-tune code

Dear @adithya-s-k ,

Thanks for the great repo.

Do you have any plans to share a fine-tuning script on customized datasets?

The issue requests a fine-tuning script for customized datasets but names no file, entry point, test, dataset format, or expected behavior. First clarify the supported model and dataset requirements; completion would need an agreed script and a documented way to verify fine-tuning works.

索引モデルが issue の本文から書いたものです。