Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+We welcome contributions! We want to make contributing to this project as easy and transparent as possible, whether it's:
+
+- Reporting a bug
+- Discussing the current state of the code
+- Submitting a fix
+- Proposing new features
+
+## We Develop with GitHub
+We use GitHub to host code, to track issues and feature requests, as well as accept pull requests.
+
+## We Use [GitHub Flow](https://docs.github.com/en/get-started/quickstart/github-flow), So All Code Changes Happen Through Pull Requests
+Pull requests are the best way to propose changes to the codebase (we use [GitHub Flow](https://docs.github.com/en/get-started/quickstart/github-flow)). We actively welcome your pull requests:
+
+1. Fork the repository and create your branch from `main`.
+2. If you've added code that should be tested, add tests.
+3. Ensure the test suite passes.
+4. Submit that pull request!
+
+## Report bugs using GitHub's [issues](https://github.com/kehoecj/validate-configs-action/issues)
+We use GitHub issues to track public bugs. Report a bug by [opening a new issue](https://github.com/kehoecj/validate-configs-action/issues/new);