Add SECURITY.md policy file

Fixes: #149

SECURITY.md

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+# Reporting Security Issues
+
+If you believe you have found a security vulnerability in PyTorch, 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/pytorch/pytorch/security/advisories/new
+
+Please refer to the following page for our responsible disclosure policy, reward guidelines, and those things that should not be reported:
+
+https://www.facebook.com/whitehat