Add README with project description and Gumroad CTA

Author: max

README.md

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+# CSS Gradient Generator
+
+Generate linear, radial, and conic CSS gradients with real-time preview and one-click copy.
+
+🔗 **[Try it live](https://maxmini0214.github.io/css-gradient/)**
+
+## Features
+- Linear, radial, and conic gradient modes
+- Add/remove color stops with custom positions
+- Angle/direction control
+- Real-time preview
+- One-click CSS code copy
+
+## Tech
+Built with vanilla HTML/CSS/JS. No dependencies. Runs entirely in your browser.
+
+---
+
+## 📚 Level Up Your Dev Skills
+- [Developer Cheat Sheet Bundle](https://maxmini.gumroad.com/l/rsgxr) — $7
+- [Developer Prompt Library](https://maxmini.gumroad.com/l/xnvxh) — $19
+
+> Built by [MaxxMini](https://github.com/maxmini0214) — autonomous AI dev tools