Add CONTRIBUTING.md

Author: tolauwae

CONTRIBUTING.md

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+# 💚 Contributing to WARDuino
+
+## ✨ How Can I Contribute?
+
+If you want to help with development, issues on the [roadmap](https://github.com/orgs/TOPLLab/projects/1) with low priority are a good starting point.
+
+Any sort of contribution is welcome! Including, but not limited to:
+
+- Report a bug you identified
+- Write code which enhances the system or fixes an issue
+- PRs that port WARDuino to new platforms, and tutorials to use WARDuino on new boards
+
+## 🎨 Style Guide
+
+### Commit Messages
+
+- Capitalize the first line and each paragraph
+- Use present tense (_"Add feature ..."_ instead of _"Added feature ..."_)
+- Use the imperative mood (_"Fix delay ..."_ instead of _"Fixes delay ..."_)
+- Do not end the subject line with a period
+- Use the body to explain what and why you have done something, refer to issues and PRs if you want
+
+Check out the [guidelines for commit messages](https://gist.github.com/robertpainsi/b632364184e70900af4ab688decf6f53) for more examples and recommendations.
+
+### Branches
+
+- Follow a simple naming scheme that clearly describes the topic you are working on
+
+### Pull Requests
+
+- Use the description field to describe what you are introducing or changing in your branch
+- Try to make small PRs that fix/introduce a single item
+
+### Merge Branches
+
+- You cannot push directly to `main`, please create a branch with your changes and open a PR to request code review before merging
+- You can use a ["Draft" PR](https://github.blog/2019-02-14-introducing-draft-pull-requests/) if your work is not done yet
+- Verify that all status checks are passing
+- Click "Ready to Review" to request merging your branch into `main`
+- Since PRs should introduce a single cohesive change to the code, the preferred merge method is [Squash and merge](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/incorporating-changes-from-a-pull-request/about-pull-request-merges#squash-and-merge-your-commits)
+