chore(docs): add contributor guidelines

Signed-off-by: kmova <kiran.mova@mayadata.io>

CODE_OF_CONDUCT.md

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+## Community Code of Conduct
+
+This project follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).

GOVERNANCE.md

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+This is a OpenEBS sub project and abides by the 
+[OpenEBS Project Governance](https://github.com/openebs/openebs/blob/master/GOVERNANCE.md).

MAINTAINERS

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+# Official list of OpenEBS Maintainers.
+#
+# Names added to this file should be in the following format:
+#     Individual's name,@githubhandle, Company Name
+#
+# Please keep the below list sorted in ascending order.
+#
+#Maintainers
+"Kiran Mova",@kmova,MayaData
+"Mehran Kholdi",@semekh,Hamravesh

SECURITY.md

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+This is a OpenEBS sub project and abides by the 
+[OpenEBS Security Release Process](https://github.com/openebs/openebs/blob/master/SECURITY.md).