docs: add security policy

[skip ci]

Author: streamich

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We release patches for security vulnerabilities. The latest major version
+will support security patches.
+
+## Reporting a Vulnerability
+
+Please report (suspected) security vulnerabilities to
+**[[email protected]](mailto:[email protected])**. We will try to respond
+within 48 hours. If the issue is confirmed, we will release a patch as soon
+as possible depending on complexity.