Thank you for your work Aman. Great work. getting your extension to work.
Does your extension really simplify the temperature conversion? A beginner does have to load your extension. It is exciting you are learning how to make extensions. I think what others are pointing out is something similar can easily be done with Blocks too. I hope your extension is used by others but they may prefer to use Blocks.
Keep building extensions. Not everyone has the skills necessary. Perhaps your next extension Project should be an extension that does something that can not be replicated with Blocks. Looking forward to that.