Add CONTRIBUTING.md guide

CONTRIBUTING.md

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+# Contributing to the OpenSSF Best Practices for Open Source Developers Working Group
+
+Welcome! We're excited that you're interested in contributing to the Best Practices for Open Source Developers Working Group. We aim to create a supportive, inclusive environment where everyone can thrive and make meaningful contributions.
+
+## How to Connect with Us
+
+- **Public Calendar:** Stay informed about our meetings, events, and activities by checking our [public calendar](https://openssf.org/calendar/).
+
+- **Slack Channel:** Join the conversation on our #wg-best-practices-ossdev [OpenSSF Slack channel](https://openssf.slack.com/archives/C01AHCRP8BT). This is the best place to ask questions, share ideas, and collaborate.
+
+## How to Contribute
+
+We value all contributions, from improving documentation to participating in discussions and developing new initiatives. Here’s how you can get started:
+
+### 1. Participate in Discussions
+
+- Join our #wg-best-practices-ossdev channel via the [OpenSSF Slack channel](https://openssf.slack.com/archives/C01AHCRP8BT).
+
+- Attend working group meetings listed on the public calendar.
+
+### 2. Report Issues or Suggest Enhancements
+
+- Use the [GitHub Issues](https://github.com/ossf/wg-best-practices-os-developers/issues) tab to report problems or suggest ideas.
+- Follow our issue template to provide clear and detailed information.
+
+### 3. Submit Pull Requests
+
+- Fork the repository.
+- Create a feature branch (`git checkout -b feature/your-feature-name`).
+- Commit changes (`git commit -m 'Add your message here'`).
+- See here for more information on [signing your commit](https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits).
+- Push your branch (`git push origin feature/your-feature-name`).
+- Open a Pull Request (PR) with a detailed description.
+
+### 4. Review Process
+
+- All PRs are reviewed by maintainers.
+- Ensure your PR is well-documented and follows project guidelines.
+- Be open to feedback and ready to make improvements.
+- Don't hesitate to post a reminder if you didn't get any feedback after some time, e.g. two weeks.
+
+## Code of Conduct
+
+We are committed to maintaining a welcoming, inclusive, and respectful environment. Please read and follow our [Code of Conduct](https://github.com/ossf/wg-best-practices-os-developers/blob/main/code-of-conduct.md) to ensure a positive experience for everyone.
+
+## Community Expectations
+
+- **Be Respectful:** Value each other's ideas and contributions.
+- **Be Collaborative:** Work together to solve problems and build new initiatives.
+- **Be Open:** Share your knowledge and be open to learning from others.
+
+We’re excited to collaborate with you and appreciate your support in advancing open source cybersecurity!
+
+For any questions or additional guidance, contact us through Slack or during our working group meetings.