Create CONTRIBUTING.md

Author: KajizukaTaichi

Diff for: CONTRIBUTING.md

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+# Contributing Guidelines
+
+Thank you for your interest in contributing to the **Stack Programming Language** project! We appreciate your efforts and welcome new ideas and suggestions for improvement.
+
+## How to Contribute
+
+1. Fork the project.
+
+2. Create a branch for new features or fixes.
+
+3. Make your changes and commit them.
+
+4. Create a pull request (PR). Please include details of the changes and reference any related issue numbers.
+
+5. Address feedback from reviewers if applicable.
+
+6. Once your PR is reviewed and approved, your code will be merged.
+
+## Pull Request Guidelines
+
+- Pull requests for new features or bug fixes are encouraged to have a related Issue.
+
+- Add tests for your changes, and make sure existing tests pass.
+
+- Maintain a consistent code style and include clear comments.
+
+## Code of Conduct
+
+We adhere to the [Code of Conduct](CODE_OF_CONDUCT.md). All contributors are expected to follow this code.
+
+## Support
+
+For questions or proposals, please use the [Issues](https://github.com/example/stack-lang/issues) section for discussion. You can also join our Slack channel for additional support.
+
+We appreciate your contributions to the **Stack Programming Language** community!