chore: update policy documents

Signed-off-by: Abhinandan Purkait <[email protected]>

Author: Abhinandan-Purkait

CODE_OF_CONDUCT.md

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+# Code of Conduct
+<BR>
+
+## Umbrella Project
+OpenEBS is an "umbrella project". Every project, repository and file in the OpenEBS organization adopts and follows the policies found in the Community repo umbrella project files.
+<BR>
+
+This project follows the [OpenEBS Code of Conduct](https://github.com/openebs/community/CODE_OF_CONDUCT.md)

CONTRIBUTING.md

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+# Contributing Guidelines
+<BR>
+
+## Umbrella Project
+OpenEBS is an "umbrella project". Every project, repository and file in the OpenEBS organization adopts and follows the policies found in the Community repo umbrella project files.
+<BR>
+
+This project follows the [OpenEBS Contributor Guidelines](https://github.com/openebs/community/CONTRIBUTING.md)
+
+# Contributing Guidelines
+<BR>
+
+## Umbrella Project
+OpenEBS is an "umbrella project". Every project, repository and file in the OpenEBS organization adopts and follows the policies found in the Community repo umbrella project files.
+<BR>
+
+This project follows the [OpenEBS Contributor Guidelines](https://github.com/openebs/community/CONTRIBUTING.md)
+

GOVERNANCE.md

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+# Governance
+<BR>
+
+## Umbrella Project
+OpenEBS is an "umbrella project". Every project, repository and file in the OpenEBS organization adopts and follows the policies found in the Community repo umbrella project files.
+<BR>
+
+This project follows the [OpenEBS Governance](https://github.com/openebs/community/GOVERNANCE.md)

MAINTAINERS

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+See [OpenEBS Maintainers](https://github.com/openebs/community/MAINTAINERS.md)