Create SECURITY.md (#4868)

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Firmware Version    | Supported          |
+| ------------------- | ------------------ |
+|    2.5.x            | :white_check_mark: |
+| <= 2.4.x            | :x:                |
+
+## Reporting a Vulnerability
+
+We support the private reporting of potential security vulnerabilities. Please go to the Security tab to file a report with a description of the potential vulnerability and reproduction scripts (preferred) or steps, and our developers will review.