docs(governance): add security doc to the root

Author: heitorlessa

SECURITY.md

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+<!-- markdownlint-disable MD043 -->
+
+## Reporting a Vulnerability
+
+If you discover a potential security issue in this project we ask that you notify AWS/Amazon Security
+via our [vulnerability reporting page](http://aws.amazon.com/security/vulnerability-reporting/) or directly via email to [email protected].
+
+Please do **not** create a public GitHub issue.