Update to Repos.csv: Added domain reviewer

This merge request updates the Repos.csv file to include the domain reviewer information for my project.

• Project Name: Polar-bear-robot
• Project Topic: Robot kinematics and dynamics software
• Domain Reviewer: Alaap Grandhi
• Branch: Main

This change ensures that all necessary project details are properly documented and up to date.

Thank you Professor Smith, review and let me know if any further modifications are required.