Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribution Guidelines
+---
+
+Ensure your pull request adheres to the following guidelines:
+
+- Add links that refer to Ansible (Can be github project, blog article, video, ...)
+- Explain quickly why this need to be there, how it's recognized by the community (by stars, by articles about it, recognized by company ou contributor)
+- Add links in the good section and in an alphabetical order
+
+Thank you for your suggestions!
+
+## Updating your PR
+
+A lot of times, making a PR adhere to the standards above can be difficult.
+If the maintainers notice anything that we'd like changed, we'll ask you to
+edit your PR before we merge it. There's no need to open a new PR, just edit
+the existing one. If you're not sure how to do that,
+[here is a guide](https://github.com/RichardLitt/knowledge/blob/master/github/amending-a-commit-guide.md)
+on the different ways you can update your PR so that we can merge it.