Add project documentation and AI assistant guidelines

.prompts/project-info.prompttemplate

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+# JSON Forms Documentation Website
+
+Docusaurus-based documentation website for [JSON Forms](https://github.com/eclipsesource/jsonforms), a declarative framework for building JSON Schema based forms.
+
+## Key Architectural Decisions
+
+- **Content in `/content/`**: All MDX content lives here, NOT in `/docs/` (Docusaurus default)
+- **Sidebars in `/src/sidebars/`**: Navigation configs are separate files, not in docusaurus.config.js
+- **Custom Blog Plugin** (`plugins/custom-blog-plugin.js`): Injects latest post into homepage
+- **Version fetching**: `build.sh` queries GitHub API, writes to `/static/current-version.js`
+
+## Important Patterns
+
+### Interactive Examples
+Use the `Demo` component (`src/components/common/Demo.js`) which renders JSON Forms with Material-UI and provides tabbed Schema/UI Schema/Form views.
+
+### Adding Documentation
+1. Create MDX file in `/content/docs/` or `/content/examples/`
+2. Add entry to the appropriate sidebar in `/src/sidebars/`
+
+### Custom Renderers
+Example custom renderers exist in `src/components/common/` (rating, country, region controls).
+
+### Component Development
+- React components go in `/src/components/`
+- Use the existing Demo component pattern for interactive examples
+- Follow CSS Modules pattern for component-specific styles
+
+## Important Guidelines
+
+**Always build and test changes**: Run the build to check for compilation errors, then start the dev server and visually verify changes work correctly. Check for console errors in the browser. Do not consider a task complete until the build passes and changes have been visually verified.

CLAUDE.md

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+# JSON Forms Documentation Website
+
+For detailed architecture, see [.prompts/project-info.prompttemplate](.prompts/project-info.prompttemplate).
+
+## Development Commands
+
+### Install Dependencies
+```bash
+npm ci
+```
+
+### Start Development Server
+```bash
+npm start
+```
+This starts the local development server at `http://localhost:3000` with hot-reloading.
+
+### Build for Production
+```bash
+npm run build
+```
+This generates static files in the `/build` directory.
+
+### Serve Production Build Locally
+```bash
+npm run serve
+```
+Serves the built site locally to verify the production build.
+
+### Clear Cache
+```bash
+npm run clear
+```
+Clears the Docusaurus cache if you encounter build issues.