Scroll to top / “Back to top” link at bottom of README

[alizahh-7]

Description:
Add a “Back to top” (scroll-to-top) link at the bottom of the repository README so readers can quickly return to the top after scrolling. This improves navigation for long READMEs and makes the repo more user-friendly.

Why:

Long READMEs can be tedious to navigate on mobile and desktop.

A simple “Back to top” link improves UX and accessibility.

Low-risk, high-visibility polish for the repository.

[eccentriccoder01]

Go ahead @alizahh-7❕