docs: add SECURITY.md

Signed-off-by: AtomicFS <[email protected]>

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We support only the single latest version.
+
+Supporting multiple versions would create too much workload. Thank you for understanding.
+
+
+## Reporting a Vulnerability
+
+Please do not report security vulnerabilities through public GitHub issues. Instead, please email [[email protected]](mailto:[email protected]?subject=firmware%2Daction%3A%20vulnerability%20report).
+
+
+## Preferred Languages
+
+We prefer all communications to be in English.
+