Add CONTRIBUTING.md

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: oferlmntr

CONTRIBUTING.md

@@ -0,0 +1,38 @@
+# Contributing
+
+Contributions are welcome! Here's how to get started.
+
+## Setup
+
+```bash
+git clone https://github.com/ofershap/deep-diff-ts.git
+cd deep-diff-ts
+npm install
+```
+
+## Development
+
+```bash
+npm run build        # Build with tsup
+npm run typecheck    # Type-check with tsc
+npm test             # Run tests
+npm run test:watch   # Run tests in watch mode
+npm run lint         # Lint + format check
+npm run format       # Auto-format with Prettier
+```
+
+## Pull Requests
+
+1. Fork the repo and create a branch from `main`
+2. Make your changes
+3. Add or update tests as needed
+4. Ensure `npm run lint`, `npm run typecheck`, and `npm test` all pass
+5. Open a pull request
+
+## Commit Messages
+
+This project uses [Conventional Commits](https://www.conventionalcommits.org/) and [semantic-release](https://github.com/semantic-release/semantic-release) for automated versioning. Please format your commit messages accordingly:
+
+- `feat: add new feature` (triggers minor release)
+- `fix: resolve bug` (triggers patch release)
+- `feat!: breaking change` (triggers major release)