[ELY-2484] Add SECURITY.md file

SECURITY.md

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+# Security Policy 
+
+## Security Contacts and Procedures
+
+The WildFly Elytron community takes security very seriously, and we aim to take immediate action to address serious security-related problems that involve our products or services.
+
+Please report any suspected security vulnerability in this project to Red Hat Product Security at [email protected]. You can use our GPG key to communicate with us securely.
+
+To report an issue in any Red Hat branded website or online service, please contact Red Hat Information Security at [email protected].
+https://access.redhat.com/security/team/contact
+