Create SECURITY.md

SECURITY.md

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+# 安全策略 Security Policy
+
+## 受支持的版本 Supported Versions
+
+目前 v2ray-core 项目由 [V2Fly 社区](https://github.com/v2fly) 继续提供代码维护，由于精力有限且项目复杂度较高，只维护主线代码的功能和安全性完整。原则上主页的兼容性保证继续遵循，
+如有例外另行说明。
+
+Currently v2ray-core project is maintained by [V2Fly community](https://github.com/v2fly). Feature and security guarantee may only be limited to the
+master branch, though we would still try our best to follow the compatiblity claims listed on the official website.
+
+
+## 汇报安全风险 Reporting a Vulnerability
+
+可以使用邮箱 dev |at| v2fly.org，或下方列出的 gpg 公钥在 GitHub 提交 issue 并注明安全风险。
+
+You can either use email dev |at| v2fly.org, or directly open an GitHub issue with the gpg key listed below.