docs(security): cross-reference security docs

Signed-off-by: Tiago Castro <tiagolobocastro@gmail.com>

Author: tiagolobocastro

SECURITY.md

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+# Security Policy
+
+<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 Security Policy](https://github.com/openebs/community/blob/HEAD/SECURITY.md).

SECURITY_CONTACTS.md

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+# Security Contacts
+
+<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>
+
+Please refer to the [OpenEBS Security Contacts](https://github.com/openebs/community/blob/HEAD/SECURITY_CONTACTS.md).