Create CONTRIBUTING.md

Author: ckaznocha

CONTRIBUTING.md

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+# Contributing
+Enhancements or fixes are welcome
+
+## Issues
+Check if a ticket for your issue already exists in GitHub issues. If you don't find a ticket submit a new one.
+
+## Pull Requests
+1. Fork the repo
+1. Create your new branch from `master`.
+1. Make your changes.
+1. Commit and push the topic branch.
+1. Submit a pull request.
+
+###Style
+- Lint your code with ShellCheck.
+- Follow the existing conventions.
+
+## License
+By contributing to Bootable2VBox you agree that your contributions will be licensed under its MIT license.