Create CONTRIBUTING.md

initial contributing guidelines

Author: Vladimir Kotal

CONTRIBUTING.md

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+Any kind of contribution is welcome. If you are not sure whether your idea is in line with 
+the general direction of the project, feel free to submit new Issue first and let's get the discussion started there.
+
+For pull requests to be merged, we need contributors to get Oracle Contributor Agreement first.
+See http://www.oracle.com/technetwork/community/oca-486395.html for details.