feat: Added my own css gradient generator project

[Aerospace-prog]

This PR significantly upgrades the "Interactive CSS Gradient Generator" by implementing a modern UI, expanding gradient creation capabilities, and improving user feedback.

Key Changes:

• Modern UI/UX: Applied a "cool and glossy" design to buttons, input fields, and the main container, with subtle animations for a polished look.
• Expanded Gradient Features:
  • Added support for radial gradients.
  • Enabled multiple color stops for complex gradients.
  • Introduced a random gradient generator for quick inspiration.
• Responsive Design: Ensured full responsiveness across various devices.
• Animated Toast Notification: Replaced the alert() with a sleek, animated toast when CSS is copied.
• Updated README.md: Documentation now reflects all new features and usage instructions.

How to Test:

1. Open index.html in a browser.
2. Experiment with linear/radial gradients, multiple color stops, and the random generator.
3. Verify the animated "CSS Copied!" toast when copying CSS.
4. Check responsiveness by resizing the browser window.

Contributor: Aerospace-prog

Closes: Close #28
@Tejas-Santosh-Nalawade

[Aerospace-prog]

@Tejas-Santosh-Nalawade Kindly review it and add the necessary tags for hacktoberfest