Create CONTRIBUTING.md

Author: michalmikolajczyk

CONTRIBUTING.md

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+# Welcome!
+
+Hi and welcome to the Community!
+
+## Workflow
+
+The work on this project, starts with an Issue, and follows [Github Flow](https://guides.github.com/introduction/flow/)
+
+## Developer's Certificate of Origin 1.1
+
+[source](https://developercertificate.org/)
+
+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.
+
+## Contact
+
+If case of questions, reach out to as at [email protected]