Docs : Add Table of Contents in README

[imBharathkumarp]

• Add Table of Contents with Toggle Button (Space Saving)
• To quick and improved navigation
• I'm a contributor at OSCI'2025
• @GollaBharath , Please assign me

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊

[DeadIndian]

Done, please start working on it and submit a PR