Update CONTRIBUTING.md

[acocac]

Summary

Fix #201

List of changes proposed in this PR (pull-request)

• Make a more accessible CONTRIBUTING.md based on the Turing Way.

What should a reviewer concentrate their feedback on?

• [ ] Do sections covered most of existing ways to contribute?
• [ ] All ok with the hyperlinks?
• [ ] Everything looks ok?

Acknowledging contributors

• [ ] All contributors to this pull request are already named in the table of contributors in the README file.
• [x] The following people should be added to the table of contributors in the README file:

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[acocac]

Thanks for this nice and comprehensive guidelines.

Thank you! Let's revisit CONTRIBUTING.md at later stage. I think we should add a short section how to contribute to new notebooks or cross-reference guidelines if necessary.