Add table of contents to readme

[Vanoita]

To enhance the organization and accessibility of the README file, I want to include a table of contents. A table of contents provides an overview of the sections or topics covered in the document, allowing readers to quickly navigate to the specific information they need.

[SrijanShovit]

Hello Vanoita, thanks for opening a issue, your contribution is valuable to us. The maintainers will review this issue and provide feedback as soon as possible.

[shreya024]

Not required