Creating guide lines for contributing

CONTRIBUTING.md

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+We appreciate and recognize [all contributors](https://github.com/veggiemonk/awesome-docker/graphs/contributors).
+
+# Contribution Guidelines
+
+- **To add to the list:** Submit a pull request
+- **To remove from the list:** Open an issue
+
+`awesome-docker` is a hand-crafted list for high-quality information about docker and its resources.
+
+- List items should be sorted *alphabetically*.
+- 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, concise, and non-promotional
+- Descriptions should follow the link, on the same line
+
+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 stating when a entry is relating to (Linux) containers and not Docker
+- Clearly "what is it" --> which category it belongs : article, docker image, 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
+- if it is a work in progress (not safe for production), mention it. (Remember the time before Docker 1.0 ? ;-) )