Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Contributing Guidelines:
+
+We appreciate and recognize all contributors.
+
+Contribution Guidelines
+* To add to the list: Submit a pull request
+* To remove from the list: Submit a pull request
+* Want to change something: Submit a pull request
+* Want to try something else: Submit a pull request
+* Don't know what to do: Submit a pull request
+
+* Each item should be limited to one link
+* The link should be the name of the package or project or website
+* Descriptions should be clear and concise (read it out loud to be sure)
+* Descriptions should follow the link, on the same line
+* If you want to add more than one link, please don't do all PR on the exact same line, it usually results in conflicts and your PR cannot be automatically merged...
+* Please contribute links to packages/projects you have used or are familiar with. This will help ensure high-quality entries.
+
+Quality standard
+
+To be on the list, it would be nice if entries adhere to these quality standards:
+
+* Generally useful to the community
+* Clearly "what is it" --> which category it belongs : article, video, twitter account, ...
+* Clearly stating "what is it for": mention the problem it solves. Just try your best, make it clear for the next person.
+* Solves a real problem (even a small one)
+* If it is a WIP (work in progress, not safe for production), mention it. 
+
+Abstract taken from [awesome-docker](https://github.com/veggiemonk/awesome-docker/blob/master/CONTRIBUTING.md)