Add back-to-top scroll up button in readme

[T-Fathima]

Initiative (Required)

GSSoC (Girl Script Summer of Code) 🌸

Explain what you want to add/change in the documentation.

This feature involves adding a Back-to-Top button to the README page which allows users to quickly scroll back to the top of the page with a single click.
It would look something like this:

@Kushal997-das I would like to work on it.
Please assign it to me.

[github-actions]

@T-Fathima

It's great having you contribute to this project

Thanks for opening this Issue 🙌 , Welcome to Project Guidance 💖 We will review everything and get back to you.
Make sure to give a star to this repo before making a fork! Thank you :)

[Kushal997-das]

@T-Fathima Tell me under which program are you contributing ?

[github-actions]

Hi @T-Fathima 👋, your issue #1629 has been successfully closed ✅. Thank you for your valuable contribution! 🙌