docs: add SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+To report vulnerabilities, you can privately report a potential security issue
+via the GitHub security vulnerabilities feature. This can be done here:
+
+https://github.com/i-am-bee/bee-agent-framework/security/advisories
+
+Please do **not** open a public issue about a potential security vulnerability.
+
+You can find more details on the security vulnerability feature in the GitHub
+documentation here:
+
+https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing/privately-reporting-a-security-vulnerability