feat: add fade shadow utility submission

[Shreeya1207]

Description

This PR adds a new submission demonstrating a Fade Shadow Utility animation effect.

Added Effect

• fade-shadow

Files Added

• submissions/examples/ease-fade-shadow/demo.html
• submissions/examples/ease-fade-shadow/style.css
• submissions/examples/ease-fade-shadow/README.md

Demo

The demo showcases cards that smoothly transition from a flat appearance to an elevated state by gradually increasing shadow intensity on hover. The effect provides subtle visual feedback and creates a sense of depth without overwhelming the interface.

Why

Fade shadow effects are commonly used in modern UI design to improve visual hierarchy, emphasize interactive elements, and create a more engaging user experience. They work well for cards, panels, feature sections, and other interactive components. This utility is lightweight, reusable, and aligns with EaseMotion CSS's philosophy of expressive and human-readable animation utilities.

Checklist

• Added files only inside submissions/
• Included demo.html
• Included style.css
• Included README.md
• One feature per PR
• Demo works without external dependencies
• Followed contribution guidelines

[github-actions]

✅ Submission Validation Passed!

Great job! All required files are present.

📁 Folder: submissions/examples/ease-fade-shadow

Files found:

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

🚀 Next Steps:

• The maintainer will review your PR
• Respond to any feedback if requested
• Once approved, your contribution will be merged!

Thank you for contributing to EaseMotion CSS! 🎉