adding code_of conduct.md

[jyothimanoj12]

A Code of Conduct ensures inclusivity, prevents harassment, clarifies behavioral expectations, encourages professionalism, and fosters a safe, welcoming community for contributors.

plz assisn me this issue under gsoc-extended , level 1 , hacktoberfest-accepted tag

[github-actions]

Congratulations, @jyothimanoj12! 🎉 Thank you for creating your issue for Rentalog. Your contribution is greatly appreciated and we look forward to working with you to resolve the issue. Keep up the great work! Should you have any queries or require guidance, do not hesitate to ask.