Added Contribution guidelines

CONTRIBUTING.md

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+# Contribution Guide
+
+Thank you for your interest in contributing to our project! We strive to maintain a welcoming and inclusive community.
+
+## Ways to Contribute
+
+There are multiple ways you can contribute to this project:
+
+1. **Report an Issue**: If you encounter a bug or have a suggestion, please open an issue on our
+[GitHub Issues page](https://github.com/Open-CMSIS-Pack/cmsis-toolbox/issues) to start the discussion about your proposal.
+
+2. **Open a Pull Request**: Contributions are welcome, whether you're fixing a bug, adding a new feature, or improving
+documentation. You can submit a pull request to our
+[GitHub repository](https://github.com/Open-CMSIS-Pack/cmsis-toolbox/pulls) to:
+   - Provide a bug fix
+   - Add new features or enhancements
+   - Improve or expand existing documentation
+
+### Report an Issue
+
+Please feel free to raise an [issue on GitHub](https://github.com/Open-CMSIS-Pack/cmsis-toolbox/issues)
+to report misbehavior (i.e. bugs)
+
+Issues are your best way to interact directly with the maintenance team and the community.
+We encourage you to append implementation suggestions as this helps to decrease the
+workload of the very limited maintenance team.
+
+We shall be monitoring and responding to issues as best we can.
+Please attempt to avoid filing duplicates of open or closed items when possible.
+In the spirit of openness we shall be tagging issues with the following:
+
+- **bug** – This issue is identified as a bug and will be investigated.
+- **discussion** – This issue is currently under discussion.
+- **discussion done** – The discussion on this issue is complete.
+- **documentation** – This issue highlights a documentation gap, which will be addressed in future updates.
+- **duplicate** – This issue duplicates an existing one; see comments for related references.
+- **enhancement** – This issue represents a request for a new feature or improvement.
+- **question** – We need further information or clarification on this issue; please review and respond.
+- **wontfix** – While we appreciate this suggestion, we have decided not to make changes at this time.
+
+### Open a Pull Request
+
+We encourage contributions of all sizes, but please keep each contribution focused and independent. We prefer smaller,
+more manageable pull requests, which makes it easier for us to review, provide feedback, and merge changes quickly.
+
+#### Contribution Process
+
+To make a successful contribution, please follow these steps:
+
+1. **Fork the Repository**: Start by forking the repository to your GitHub account.
+
+2. **Make Your Changes**:
+   - Implement your changes, ensuring that you match the existing coding style and documentation conventions.
+   - Write unit tests for your code to ensure it is functional and reliable.
+
+3. **Write a Clear Commit Message**: Write a concise and informative commit message summarizing your changes.
+
+4. **Push to Your Fork**: Push your changes to your forked repository.
+
+5. **Submit a Pull Request (PR)**: Open a pull request against the main repository.
+
+### Review Process
+
+Our team will review your proposed changes as soon as possible. Since our tools are complex and cover a wide range of
+use cases, we may request additional modifications. This helps ensure that your contribution meets our quality
+standards, is generally applicable, and doesn’t negatively impact other use cases or maintainability.
+
+Thank you for helping us improve this project! We value your effort and commitment.