Add CONTRIBUTING.md

Author: byjg

CONTRIBUTING.md

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+# Contributing to byjg/php-swagger-test
+
+First of all, thank you for taking the time to contribute!
+
+## How to Contribute
+
+### Issues
+
+If you encounter any issues, have questions, or need clarification, please open an issue on our [Issues page](https://github.com/your-repo/issues). This helps us track and prioritize bug fixes and enhancements.
+
+### Branches
+
+We have three main branches in this project:
+
+- **master**: Contains the latest code. It is generally stable, but we recommend using it with caution.
+- **a.b**: Use this branch for creating PRs. The naming convention follows `a.b`, where `a` is the major release and `b` is the minor release of the current version. For example, if the current release is 4.9.2, use the branch `4.9` for your PR. You can also use `4.9.x-dev` in your composer for development purposes.
+- **future release**: This branch is typically `(a+1).0`. For instance, if the current release is 4.9.2, the future release branch will be `5.0`.
+
+
+### Code Style and Guidelines
+
+- **Follow PSR Standards**: We follow [PSR-1](https://www.php-fig.org/psr/psr-1/), [PSR-2](https://www.php-fig.org/psr/psr-2/), and [PSR-12](https://www.php-fig.org/psr/psr-12/).
+- **Write Clear Commit Messages**: Use the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) specification.
+- **Documentation**: Update the documentation for any new features or changes.
+
+### Common Practices
+
+- **Keep Pull Requests Small**: Smaller PRs are easier to review and merge. Focus on one feature or fix per PR.
+- **Write Tests**: Ensure your changes are covered by tests. We aim for a high level of test coverage.
+- **Respect Reviewers' Time**: Be responsive to feedback and willing to make necessary changes.
+
+### Community
+
+- **Be Respectful**.
+- **Collaborate**: We encourage collaboration and open discussion. Don’t hesitate to ask for help or provide feedback.
+
+Thank you for contributing to byjg/php-swagger-test! Your help is appreciated and makes a big difference.