Create CONTRIBUTING.md

Add contributing.md to the repository

Signed-off-by: Roger Barker <[email protected]>

Author: rbarker-dev

CONTRIBUTING.md

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+# Contributing to update-custom-properties
+
+Thank you for your interest in contributing to the `update-custom-properties` project! Whether you're submitting a bug report, fixing a bug, or adding a feature, we appreciate your help in making this action better.
+
+## How to Contribute
+
+### Reporting Issues
+
+If you've encountered a bug or have a suggestion for improvement, please check the [Issues](https://github.com/PandasWhoCode/update-custom-properties/issues) tab to see if it's already been reported. If not, feel free to open a new issue with as much detail as possible, including:
+
+- A clear description of the problem or feature request.
+- Steps to reproduce the issue (if applicable).
+- The expected behavior and any error messages.
+- Your environment details (e.g., operating system, GitHub Actions version).
+
+### Submitting a Pull Request
+
+We welcome contributions through pull requests! To submit a pull request:
+
+1. **Fork the repository**:  
+   Click the "Fork" button at the top of the repository page to create a copy of the project under your GitHub account.
+   
+2. **Clone your fork**:  
+   Clone your forked repository to your local machine:
+   ```bash
+   git clone https://github.com/YOUR_USERNAME/update-custom-properties.git
+   ```
+
+3. **Create a branch**:  
+   Create a new branch for your changes:
+   ```bash
+   git checkout -b feature-branch
+   ```
+
+4. **Make your changes**:  
+   Make your changes to the codebase. Ensure that you test your changes thoroughly and maintain existing functionality.
+
+5. **Commit your changes**:  
+   Commit your changes with a clear and concise commit message. Follow the [Conventional Commit](https://www.conventionalcommits.org/) guidelines if possible.
+   ```bash
+   git commit -m "feat: added new feature to install specific version"
+   ```
+
+6. **Push your changes**:  
+   Push your changes to your forked repository:
+   ```bash
+   git push origin feature-branch
+   ```
+
+7. **Create a Pull Request**:  
+   Open a pull request (PR) from your feature branch to the `main` branch of the original repository.
+
+8. **Describe your changes**:  
+   Provide a detailed description of the changes you made in the PR and link any relevant issues.
+
+### Code Style
+
+- Use [Prettier](https://prettier.io/) to format your code.
+- Ensure that your code follows the conventions and structure of the existing codebase.
+
+### Testing
+
+Ensure that your changes do not break existing functionality. If possible, include tests for any new features or bug fixes.
+
+### Documentation
+
+If you make changes that affect how the action works or how it is used, please update the documentation (including the `README.md` and this `CONTRIBUTING.md`) to reflect the changes.
+
+## License
+
+By contributing to this project, you agree that your contributions will be licensed under the [Apache License 2.0](https://github.com/PandasWhoCode/update-custom-properties?tab=Apache-2.0-1-ov-file#readme).
+
+## Code of Conduct
+
+By participating in this project, you agree to adhere to the project's [Code of Conduct](CODE_OF_CONDUCT.md). We strive to maintain a welcoming and respectful community for everyone.
+
+## Thank You!
+
+Your contributions are what make this project great. Thank you for helping improve `update-custom-properties`!
+
+---
+
+**Author**: [Roger Barker](https://github.com/DJ-BBot)  
+**Email**: [[email protected]](mailto:[email protected])