Create CONTRIBUTING.md

CONTRIBUTING.md

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+We're glad to see you here, willing to contribute back to the open education in Data Science. 
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+We encourage all kinds of contributions here that can help the community to learn, be it presentations on specific topics, notebooks or video tutorials. The guidelines to add them are pretty simple:
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+1. Fork and clone this repository on your GitHub account.
+2. Add the resources or make the changes in the existing ones.
+3. Push them to your fork and submit a pull request.
+4. Done! Celebrate that you took a step towards contributing to the open education.