Create CONTRIBUTING.md

CONTRIBUTING.md

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+# CONTRIBUTING.md
+
+First and foremost, thank you for considering contributing to Parlay! Your contribution is valuable and we genuinely appreciate your interest. 
+
+Parlay is a distinct software project developed by Snyk. Although separate from our core product line, it provides a platform for us to demonstrate our capabilities and some key concepts. 
+
+Please note that we monitor and respond to issues and pull requests on a best-effort basis. 
+
+### How to contribute
+
+#### Code of Conduct
+
+Prior to contributing, please familiarize yourself with our [Code of Conduct](CODE_OF_CONDUCT.md). We expect all our contributors to uphold these guidelines to maintain a respectful and inclusive environment.
+
+#### Open Development
+
+All development work on Parlay is done directly on GitHub. Both our core team members and external contributors send pull requests, which go through a unified review process.
+
+#### Reporting Issues
+
+We welcome you to raise an issue if you discover a bug, find a documentation error, or identify a feature you believe should be added. You can do this by opening a new issue in the issue tracker. Please ensure that your issue hasn't already been reported by reviewing existing issues before creating a new one. We value the time and effort you spend in providing these details.
+
+#### Pull Requests
+
+We highly recommend that contributors raise an issue before making a pull request. This allows us to discuss potential changes and prevent unnecessary or duplicative work. Once the issue has been reviewed and we've agreed on a solution, contributors can then fork the repository and submit a pull request.
+
+##### Submitting your Pull Request
+
+- Ensure your code passes all tests, and consider adding new tests for the changes you've made.
+- In your Pull Request description, provide a detailed explanation of your changes. This assists us in understanding your decision-making process and aids in the effective review of your work.
+- Remember to reference the relevant issue number in your pull request.
+
+Your time and efforts make Parlay better, and we're grateful for your support and contributions. Thank you!