Add Body and Hand motion capture projects

[ShutovKS]

Added two open-source Unity projects to the Animation section:

• Body-motion-capture-and-animation-in-Unity — body motion capture (Python + OpenCV) with real-time data transfer to Unity and character animation using IK.
• Hand-motion-capture-and-animation-in-Unity — hand motion capture (Python + OpenCV) with real-time data transfer to Unity and hand animation.

Both follow the existing list format (* [Name](link) - Description) and are appended at the end of the Animation section.

[Copilot]

Pull request overview

This PR updates the repository’s curated Animation section by adding two open-source Unity motion-capture projects (body and hand) that stream tracking data (Python + OpenCV) into Unity for real-time animation.

Changes:

• Added a link to a body motion capture + IK animation project.
• Added a link to a hand motion capture + hand animation project.

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