Add Table of Contents to README

[T-Fathima]

Description

Currently, the README lacks a table of contents, making it challenging for users to navigate sections quickly. Adding a table of contents will enhance readability and allow users to locate information faster.

@Niketkumardheeryan I would like to work on it.
Please assign it to me under gssoc-ext and hacktoberfest.

[github-actions]

Thanks for creating the issue,Please read the Pinned issued first and Readme.md in each Pull Request you made. Keep learning...