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README.md

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+# Claude Code Review Action
+
+A GitHub Action that performs automated code reviews using Claude AI.
+
+## Features
+- Analyzes code changes in pull requests
+- Provides detailed feedback on code quality
+- Identifies potential issues and suggests improvements
+- Checks for security issues and best practices
+
+## Usage
+
+Add this to your GitHub workflow file (e.g. `.github/workflows/review.yml`):
+
+```yaml
+name: Code Review
+
+on:
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          
+      - uses: your-username/claude-code-review-action@v1
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          anthropic-key: ${{ secrets.ANTHROPIC_API_KEY }}
+          pr-number: ${{ github.event.pull_request.number }}
+```
+
+## Setup
+
+1. Create repository secret `ANTHROPIC_API_KEY` with your Claude API key from Anthropic
+2. The `GITHUB_TOKEN` is automatically provided by GitHub Actions
+
+## Inputs
+
+| Input | Description | Required | Default |
+|-------|-------------|----------|---------|
+| `github-token` | GitHub token for API access | Yes | N/A |
+| `anthropic-key` | Anthropic API key for Claude | Yes | N/A |
+| `pr-number` | Pull request number to review | Yes | N/A |
+
+## Outputs
+
+| Output | Description |
+|--------|-------------|
+| `diff_size` | Size of the relevant code changes |
+| `review` | Generated code review content |
+
+## Review Format
+
+The action provides detailed code reviews covering:
+
+1. Potential conflicts with existing codebase
+2. Code correctness and potential bugs  
+3. Security vulnerabilities and risks
+4. Performance implications
+5. Maintainability and readability issues
+6. Adherence to best practices
+7. Suggestions for improvements
+
+Each issue found includes:
+- Clear problem explanation
+- Severity rating (Critical/High/Medium/Low)
+- Specific recommendations
+- Code examples where helpful
+
+## Example Review
+
+```markdown
+# Claude Code Review
+
+1. **Potential conflicts with existing codebase**:
+   - No apparent conflicts identified
+   
+2. **Code correctness and potential bugs**:
+   - **Medium Severity**: Potential null pointer in user handling
+   - Recommendation: Add null check before accessing user object
+   
+3. **Security vulnerabilities and risks**: 
+   - **High Severity**: SQL injection vulnerability in query construction
+   - Recommendation: Use parameterized queries
+```
+
+## Development
+
+1. Clone the repository
+2. Install dependencies:
+```bash
+npm install
+```
+
+3. Make changes to `action.js`
+
+4. Build the action:
+```bash
+npm run build
+```
+
+5. Run tests:
+```bash
+npm test
+```
+
+## Contributing
+
+Contributions are welcome! Please:
+
+1. Fork the repository
+2. Create a feature branch
+3. Make your changes
+4. Run tests
+5. Submit a pull request
+
+## License
+
+MIT License - see the [LICENSE](LICENSE) file for details
+
+## Support
+
+- Open an issue for bugs/feature requests
+- Submit a PR to contribute
+- Contact maintainers for other questions
+
+## Changelog
+
+See [CHANGELOG.md](CHANGELOG.md) for release history