SECURITY.md: Add initial security policy

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+# Security Policy
+
+## Supported Versions
+
+For community, we support only the latest released version. Please see https://www.dovecot.org/download for latest version.
+
+## Reporting a Vulnerability or security issue
+
+To report vulnerabilities and other security issues, please use https://hackerone.com/open-xchange.
+Please read the program scope carefully.