Create CONTRIBUTING.md

Author: almaslennikov

CONTRIBUTING.md

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+# How to Contribute
+
+Network Operator is [Apache 2.0 licensed](LICENSE) and accepts contributions via GitHub
+pull requests. This document outlines some of the conventions on development
+workflow, commit message formatting, contact points and other resources to make
+it easier to get your contribution accepted.
+
+## Coding Style
+
+Please follows the standard formatting recommendations and language idioms set out
+in [Effective Go](https://golang.org/doc/effective_go.html) and in the
+[Go Code Review Comments wiki](https://github.com/golang/go/wiki/CodeReviewComments).
+
+## Certificate of Origin
+
+In order to get a clear contribution chain of trust we use the [signed-off-by language](https://01.org/community/signed-process)
+used by the Linux kernel project.
+
+DCO can be found [here](https://developercertificate.org/)
+
+## Format of the patch
+
+Beside the signed-off-by footer, we expect each patch to comply with the following format:
+
+```
+Change summary
+
+More detailed explanation of your changes: Why and how.
+Wrap it to 72 characters.
+
+Signed-off-by: <[email protected]>
+```
+
+## Format of PR title and description
+
+Pull Request title and description are expected to conform to [conventional commits specification](https://www.conventionalcommits.org)