Create SECURITY.md (vllm-project#8642)

Author: simon-mo

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+If you believe you have found a security vulnerability in vLLM, we encourage you to let us know right away. 
+We will investigate all legitimate reports and do our best to quickly fix the problem.
+
+Please report security issues using https://github.com/vllm-project/vllm/security/advisories/new
+
+---
+Please see PyTorch Security for more information how to securely interact with models: https://github.com/pytorch/pytorch/blob/main/SECURITY.md
+This document mostly references the recommendation from PyTorch, thank you!