Create SECURITY.md

Signed-off-by: Luiz Carvalho <lucarval@redhat.com>

Author: lcarva

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+To report a security issue, please click on the "Report a vulnerability" button from the "Security" tab.
+See detailed [instructions]([url](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing/privately-reporting-a-security-vulnerability#privately-reporting-a-security-vulnerability)https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing/privately-reporting-a-security-vulnerability#privately-reporting-a-security-vulnerability).
+
+The maintainers will respond within 3 working days of the report.
+If the issue is confirmed as a vulnerability, we will open a Security Advisory.