Add draft for CONTRIBUTING

CONTRIBUTING.md

+# Contributing to CoScInE
+
+* [Code of Conduct](#code-of-conduct)
+* [Issues](#issues)
+* [Merge Requests](#merge-requests)
+* [Developer's Certificate of Origin 1.1](#developers-certificate-of-origin)
+
+## [Code of Conduct](./doc/coc.md)
+
+CoScInE has a
+[Code of Conduct](./CODE_OF_CONDUCT.md)
+to which all contributors must adhere.
+
+See [details on our policy on Code of Conduct](./doc/coc.md).
+
+## [Issues](./doc/issues.md)
+
+* [How to Contribute in Issues](./doc/issues.md#how-to-contribute-in-issues)
+* [Asking for General Help](./doc/issues.md#asking-for-general-help)
+* [Discussing non-technical topics](./doc/issues.md#discussing-non-technical-topics)
+* [Submitting a Bug Report](./doc/issues.md#submitting-a-bug-report)
+* [Triaging a Bug Report](./doc/issues.md#triaging-a-bug-report)
+* [Resolving a Bug Report](./doc/issues.md#resolving-a-bug-report)
+
+## [Merge Requests](./doc/merge-requests.md)
+
+* [Dependencies](./doc/merge-requests.md#dependencies)
+* [Setting up your local environment](./doc/merge-requests.md#setting-up-your-local-environment)
+* [The Process of Making Changes](./doc/merge-requests.md#the-process-of-making-changes)
+* [Reviewing Pull Requests](./doc/merge-requests.md#reviewing-merge-requests)
+* [Notes](./doc/merge-requests.md#notes)
+
+<a id="developers-certificate-of-origin"></a>
+## Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+* (a) The contribution was created in whole or in part by me and I
+  have the right to submit it under the open source license
+  indicated in the file; or
+
+* (b) The contribution is based upon previous work that, to the best
+  of my knowledge, is covered under an appropriate open source
+  license and I have the right under that license to submit that
+  work with modifications, whether created in whole or in part
+  by me, under the same open source license (unless I am
+  permitted to submit under a different license), as indicated
+  in the file; or
+
+* (c) The contribution was provided directly to me by some other
+  person who certified (a), (b) or (c) and I have not modified
+  it.
+
+* (d) I understand and agree that this project and the contribution
+  are public and that a record of the contribution (including all
+  personal information I submit with it, including my sign-off) is
+  maintained indefinitely and may be redistributed consistent with
+  this project or the open source license(s) involved.
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