Github special files

- code owners
- contributing

.github/CODEOWNERS

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+@qdm12

.github/CONTRIBUTING.md

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+# Contributing
+
+Contributions are [released](https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license) to the public under the [open source license of this project](../LICENSE).
+
+## Submitting a pull request
+
+1. [Fork](https://github.com/qdm12/stackedit-docker/fork) and clone the repository
+1. Create a new branch `git checkout -b my-branch-name`
+1. Modify the code
+1. Ensure the docker build succeeds `docker build .`
+1. Commit your modifications
+1. Push to your fork and [submit a pull request](https://github.com/qdm12/stackedit-docker/compare)
+
+## Resources
+
+- [Using Pull Requests](https://help.github.com/articles/about-pull-requests/)
+- [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)