Move helpers to the separate repository

CONTRIBUTING.md

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+## Contributing
+
+[fork]: https://github.com/actions/versions-package-tools/fork  
+[pr]: https://github.com/actions/versions-package-tools/compare  
+[code-of-conduct]: CODE_OF_CONDUCT.md  
+
+Hi there! We're thrilled that you'd like to contribute to this project. Your help is essential for keeping it great.
+
+Contributions to this project are [released](https://help.github.com/articles/github-terms-of-service/#6-contributions-under-repository-license) to the public under the [MIT](LICENSE.md).
+
+Please note that this project is released with a [Contributor Code of Conduct][code-of-conduct]. By participating in this project you agree to abide by its terms.
+
+## Submitting a pull request
+
+1. [Fork][fork] and clone the repository
+1. Create a new branch: `git checkout -b my-branch-name`
+1. Make your changes
+1. Push to your fork and [submit a pull request][pr]
+1. Make sure that checks in your pull request are green
+
+Here are a few things you can do that will increase the likelihood of your pull request being accepted:
+
+- Please include a summary of the change and which issue is fixed. Also include relevant motivation and context.
+- Follow the style guide for [PowerShell](https://github.com/PoshCode/PowerShellPracticeAndStyle).
+- Write [good commit messages](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
+
+## Resources
+
+- [How to Contribute to Open Source](https://opensource.guide/how-to-contribute/)
+- [Using Pull Requests](https://help.github.com/articles/about-pull-requests/)
+- [GitHub Help](https://help.github.com)