Create SECURITY.md

All for the FREE Internet!

Author: RPRX

SECURITY.md

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+# Security Policy
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+If you found an issue related to security vulnerability or protocol-identification problem, please report it to us via "[Report a vulnerability](https://github.com/XTLS/Xray-core/security/advisories/new)" privately, instead of publish it publicly before we release the fixed version.
+
+Thanks for your contribution to the FREE Internet!