Added Aritra Ghosh to Student Contributors

[aritraghosh7]

This PR adds a new testimonial card for Aritra Ghosh under the "What do our previous fellows say?" section on the Keploy Student Program webpage.

📌 Details:

• Name: Aritra Ghosh
• Role: FullStack Developer | Final Year | KIIT University
• GitHub: https://github.com/aritraghosh7
• Testimonial: "Keploy API Fellowship is a transformative experience. It helped me explore open source deeply and become a more confident contributor."

This contribution is made as part of Task 2 of the Keploy API Fellowship.

Looking forward to your feedback! 🚀

[github-actions]

Thank you and congratulations 🎉 for opening your very first pull request in student-program

[pratik-mahalle]

Hey @aritraghosh7, thank you for raising the pr. As you know this was the part of the fellowship program, we can`t merge this now.