Create CONTRIBUTING.md

CONTRIBUTING.md

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+Contributing to DNSroboCert
+===========================
+
+If you wish to contribute to the project, first, thank you a lot!
+
+DNSroboCert aims at providing a powerfull workflow to issue, manage and deploy DNS-01 challenged TLS certificates, and every contribution to make it real is welcomed.
+
+To get you on board, the official documentation is available here: https://dnsrobocert.readthedocs.io. We invite you in particular to look at the developer section, https://dnsrobocert.readthedocs.io/en/latest/developer_guide.html, that will explain how to setup a virtual environment, and the general design principle of the project to give you more context while developing.