[nnc] Add Code Of Conduct for NNC (#1938)

Describes basic requirements for any PR contributing to NNC project

Signed-off-by: Vladimir Plazun <v.plazun@partner.samsung.com>

diff --git a/contrib/nnc/doc/COC_for_nnc_developer.rst b/contrib/nnc/doc/COC_for_nnc_developer.rst
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+Code Of Conduct for NNC developer
+=================================
+
+Pull requests
+-------------
+
+- Each pull request should be less than 300 lines(excluding includes, namespaces and empty lines)
+- Do not make pull requests more than +500 lines in total.
+  Exception are PRs mostly consisting of non-code changes(e.g. docs, licenses)
+- If you make any changes not directly related to PR's main purpose (e.g. formatting, code style fixes),
+  make a note in PR description