docs: initial project setup and documentation

Add comprehensive documentation and planning for Pastel UI:
- Complete architecture design using Next.js 16 and Tailwind CSS 4
- Detailed development guide (CLAUDE.md) with all patterns and conventions
- Feature-rich README with keyboard shortcuts and export formats
- Project structure and technology stack decisions

Features planned:
- Color playground with multi-format support
- Palette generation (harmony, distinct, gradient)
- Accessibility tools (WCAG, color blindness simulation)
- Named colors explorer (148 CSS/X11 colors)
- Batch operations with CSV/JSON import/export
- Command palette (Cmd+K) and keyboard shortcuts
- Dark/light mode with system preference detection
- Shareable links with URL state

Tech stack:
- Next.js 16 with App Router and Server Components
- React 19 with latest concurrent features
- Tailwind CSS 4 with CSS-first configuration
- TypeScript strict mode
- React Query for server state
- Zustand for client state
- Framer Motion for animations

Ready for implementation phase.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Valknarness
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.