chore: add contributing guide

CONTRIBUTING.md

@@ -0,0 +1,204 @@
+# Contributing Guide
+
+Thank you for your interest in contributing to this MCP server!
+
+## Getting Started
+
+### Prerequisites
+
+- Node.js 18+
+- npm 9+
+- Git
+
+### Development Setup
+
+1. **Fork and clone the repository**
+
+   ```bash
+   git clone https://github.com/YOUR_USERNAME/Israel-law-mcp.git
+   cd Israel-law-mcp
+   ```
+
+2. **Install dependencies**
+
+   ```bash
+   npm install
+   ```
+
+3. **Build the project**
+
+   ```bash
+   npm run build
+   ```
+
+4. **Run tests**
+
+   ```bash
+   npm test
+   ```
+
+## Development Workflow
+
+### Making Changes
+
+1. Create a branch for your changes:
+   ```bash
+   git checkout -b feature/your-feature-name
+   ```
+
+2. Make your changes
+
+3. Run tests:
+   ```bash
+   npm test
+   ```
+
+4. Build to check for TypeScript errors:
+   ```bash
+   npm run build
+   ```
+
+5. Commit your changes:
+   ```bash
+   git commit -m "Description of changes"
+   ```
+
+6. Push and create a pull request
+
+### Testing with MCP Inspector
+
+To test your changes interactively:
+
+```bash
+npx @anthropic/mcp-inspector node dist/index.js
+```
+
+This opens a web UI where you can call tools and see responses.
+
+## Code Style
+
+### TypeScript
+
+- Use TypeScript strict mode
+- Define interfaces for all function inputs/outputs
+- Use async/await for all database operations
+- Use `null` for "not found", throw for invalid input
+
+### Naming
+
+- Files: `kebab-case.ts`
+- Interfaces: `PascalCase`
+- Functions: `camelCase`
+- MCP tools: `snake_case`
+- Database tables/columns: `snake_case`
+
+### Documentation
+
+- Add JSDoc comments to all exported functions
+- Include `@param` and `@returns` tags
+- Add usage examples in comments
+
+## Adding a New Tool
+
+1. Create a new file in `src/tools/`:
+   ```typescript
+   // src/tools/my-tool.ts
+   export interface MyToolInput { ... }
+   export interface MyToolResult { ... }
+   export async function myTool(db: Database, input: MyToolInput): Promise<MyToolResult> { ... }
+   ```
+
+2. Add tests in `tests/tools/my-tool.test.ts`
+
+3. Register the tool in `src/index.ts`:
+   - Add to `TOOLS` array
+   - Add case in `CallToolRequestSchema` handler
+
+4. Update README.md with tool documentation
+
+## Adding New Data
+
+### Adding a New Source
+
+1. Create a seed file in `data/seed/`:
+   ```json
+   {
+     "id": "SOURCE_ID",
+     "full_name": "Full Name",
+     "items": [ ... ],
+     "definitions": [ ... ]
+   }
+   ```
+
+2. Rebuild the database:
+   ```bash
+   npm run build:db
+   ```
+
+3. Add tests for the new data
+
+4. Update COVERAGE.md
+
+### Updating Existing Data
+
+1. Run the ingestion script:
+   ```bash
+   npm run ingest -- <identifier> data/seed/source.json
+   ```
+
+2. Rebuild the database:
+   ```bash
+   npm run build:db
+   ```
+
+3. Run tests to verify nothing broke:
+   ```bash
+   npm test
+   ```
+
+## Pull Request Guidelines
+
+### Before Submitting
+
+- [ ] Tests pass (`npm test`)
+- [ ] Build succeeds (`npm run build`)
+- [ ] No TypeScript errors
+- [ ] Documentation updated if needed
+
+### PR Description
+
+Include:
+- What changes were made
+- Why the changes were needed
+- How to test the changes
+
+### Review Process
+
+1. Automated checks must pass
+2. At least one maintainer review required
+3. Address feedback promptly
+
+## Reporting Issues
+
+### Bug Reports
+
+Include:
+- Steps to reproduce
+- Expected behavior
+- Actual behavior
+- Environment (Node version, OS)
+
+### Feature Requests
+
+Include:
+- Use case description
+- Proposed solution (if any)
+- Alternatives considered
+
+## Questions?
+
+Open a discussion on GitHub or reach out to the maintainers.
+
+---
+
+Thank you for contributing!