Merge pull request #7 from magento-borg/MC-5465-merged

MC-5465: Create plugin for composer root update lookaheads

.gitignore

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 /vendor
+/tests/Integration/Magento/ComposerRootUpdatePlugin/tmp
 /.idea

CONTRIBUTING.md

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+# Contributing to Magento code
+
+Contributions to the Magento codebase are done using the fork & pull model.
+This contribution model has contributors maintaining their own copy of the forked codebase (which can easily be synced with the main copy). The forked repository is then used to submit a request to the base repository to “pull” a set of changes (hence the phrase “pull request”).
+
+Contributions can take the form of new components/features, changes to existing features, tests, documentation (such as developer guides, user guides, examples, or specifications), bug fixes, optimizations, or just good suggestions.
+
+The Magento development team will review all issues and contributions submitted by the community of developers in first-in, first-out order. During the review we might require clarifications from the contributor. If there is no response from the contributor for two weeks, the issue is closed.
+
+For large features or changes, please [open an issue](https://github.com/magento/composer-root-update-plugin/issues) for discussion before submitting any code. This will prevent duplicate or unnecessary effort and can also increase the number of people involved in discussing and implementing the change.
+
+## Contribution requirements
+
+1. Contributions must adhere to [Magento coding standards](http://devdocs.magento.com/guides/v2.3/coding-standards/bk-coding-standards.html).
+2. Pull requests (PRs) must be accompanied by a complete and meaningful description. Comprehensive descriptions make it easier to understand the reasoning behind a change and reduce the amount of time required to get the PR merged.
+3. Commits must be accompanied by meaningful commit messages.
+4. PRs which include bug fixing must be accompanied by step-by-step instructions how to reproduce the issue (including the local composer version reported by `composer --version`).
+5. PRs which include new logic or new features must be submitted along with:
+    * Unit/integration test coverage where applicable.
+    * Updated documentation in the project's `docs` directory.
+6. All automated tests must pass successfully.
+
+Any contributions that do not meet these requirements will not be accepted.
+
+### Composer compatibility
+
+Maintaining compatibility with the Composer versions listed in the [composer.json](composer.json) file is important for this project. Due to the way Composer works with plugins, the version that is used when the plugin runs is the local `composer.phar` executable version (as reported by `composer --version`) and not the version installed in the project's `vendor` folder or `composer.lock` file. This means that in order to properly verify Composer compatibility, tests must be run against the local `composer.phar` executable, not just the installed `composer/composer` dependency.
+
+Additionally, because of the way the plugin interacts with the native `composer require` command, some parts of the Composer library sometimes need to be re-implemented in an accessible manner if the original code is in private methods or part of larger functions. Such implementations should be located in the [Magento\ComposerRootUpdatePlugin\ComposerReimplementation](src/Magento/ComposerRootUpdatePlugin/ComposerReimplementation) namespace and documented with the reason for re-implementation and a link to the original method. 
+
+## Contribution process
+
+If you are a new GitHub user, we recommend that you create your own [free GitHub account](https://github.com/signup/free). By doing so, you will be able to collaborate with the Magento development team, fork the GitHub project and easily send pull requests for any changes you wish to contribute.
+
+1. Search the current listed issues (open or closed) on the [magento/composer-root-update-plugin](https://github.com/magento/composer-root-update-plugin/issues) and [magento/magento2](https://github.com/magento/magento2/issues) GitHub repositories before starting work on a new contribution.
+2. Review the [Contributor License Agreement](https://magento.com/legaldocuments/mca) if this is your first time contributing.
+3. Create and test your work.
+4. Fork the repository according to the [Fork a repository instructions](http://devdocs.magento.com/guides/v2.3/contributor-guide/contributing.html#fork).
+5. When you are ready to send us a pull request, follow the [Create a pull request instructions](http://devdocs.magento.com/guides/v2.3/contributor-guide/contributing.html#pull_request). The instructions are written for the `https://github.com/magento/magento2` repository, but they also apply to `https://github.com/magento/composer-root-update-plugin`.
+6. Once your contribution is received, the Magento 2 development team will review the contribution and collaborate with you as needed if it is accepted.
+
+## Code of Conduct
+
+Please note that this project is released with a Contributor Code of Conduct. We expect you to agree to its terms when participating in this project.
+The full text is available in the Magento 2 repository [Wiki](https://github.com/magento/magento2/wiki/Magento-Code-of-Conduct).

LICENSE.txt

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