feat(examples): add ease-nod — element nods up and down once

[ARPANPATRA111]

Description

Element bobs downward then back up, like nodding in agreement. One-shot translateY(0) → translateY(6px) → translateY(0) animation.

Acceptance Criteria

• translateY(0) → translateY(6px) → translateY(0)
• One-shot, 0.4s

Files

• demo.html — nod card demo
• style.css — nod keyframes
• README.md — documentation

Related Issue

Closes #17179

[SAPTARSHI-coder]

✅ Submission Validation Passed!

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📁 Folder: submissions/examples/ease-nod

Files found:

• ✅ demo.html
• ✅ style.css
• ✅ README.md

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[github-actions]

🎉 Congratulations on your PR merge, @ARPANPATRA111! 🚀

Thank you so much for your valuable contribution to EaseMotion CSS! Your code is now merged into the main branch.

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[github-actions]

🎉 Pull Request Integrated!

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