Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+This document describes how to contribute to this repository. Pull
+requests containing bug fixes, updates, and extensions to the existing
+workflows in this repository will be considered for inclusion.
+
+## How to contribute
+
+* Make sure you have a [GitHub account](https://github.com/signup/free)
+* Make sure you have git [installed](https://help.github.com/articles/set-up-git)
+* Fork the repository on [GitHub](https://github.com/galaxyproject/iwc/fork)
+* Make the desired modifications - consider using a [feature branch](https://github.com/Kunena/Kunena-Forum/wiki/Create-a-new-branch-with-git-and-manage-branches).
+* Make sure you have added the necessary tests for your changes and they pass.
+* Open a [pull request](https://help.github.com/articles/using-pull-requests)
+  with these changes.
+
+## What to contribute
+
+* Galaxy workflows using [OSI licensed](https://opensource.org/licenses/alphabetical) tools
+* Bug fixes
+* Documentation improvements
+* New test cases
+
+## What not to contribute
+
+* Things already wrapped and currently maintained by other users
+* Workflows without tests
+
+## Tests
+
+Contributed workflows should include reasonable tests with small example data.
+
+The IWC strongly recommends testing with [planemo](https://github.com/galaxyproject/planemo/), which provides a simple command line utility for testing functionality.
+
+```console
+$ planemo test my_workflow.ga
+```
+
+In some cases, you might find it simpler to run tests against an external Galaxy server:
+
+
+```console
+$ planemo test my_workflow.ga --galaxy_url https://usegalaxy.org --galaxy_user_key API_KEY
+```
+
+## Requirements for Contributions
+
+Before a PR will be accepted, meaningful review for correctness and quality will need to be established.
+
+* Tests (and test-data) must be provided for all workflows
+* Continuous integration tests must pass: 
+    * The tests must pass (`planemo test my_workflow.ga`)
+    * The workflows must pass linting by planemo (`planemo lint my_workflow.ga`)
+* If there's a relevant paper for the workflow, it should be cited in a the README file.
+* The workflow must be licensed to allow use by anyone. The OSI maintains a [list of appropriate](https://opensource.org/licenses/alphabetical) licenses
+* At least one approving review by an IWC member