Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| >= 2.x   | yes |
+| < 2.0.0   | no                |
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please send an email with detailed information to hmpllang@gmail.com or open [issue](https://github.com/hmpl-language/hmpl/issues/new) on GitHub