Create SECURITY.md

Author: levkk

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Since the project is currently pre-v1.0, only the latest released version
+is supported with security updates. Users are expected to upgrade to the
+newest version to receive security fixes.
+
+## Reporting a Vulnerability
+
+Please report any vulnerabilities to [email protected]. You'll get a acknowledgement
+within 24 hours. Any high priority vulnerabilities will be fixed within 72 hours.
+