Create SECURITY.md

Author: krylosov-aa

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We actively support and maintain the following versions:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.x.x   | ✅ |
+
+## Reporting a Vulnerability
+
+If you discover a potential security issue or vulnerability, please **open a GitHub Issue** in this repository and describe:
+
+- what you found (and how it might be exploited)
+- which version you tested
+- and any relevant details or examples
+
+[Create a new Issue](https://github.com/krylosov-aa/context-async-sqlalchemy/issues/new)
+
+Please avoid posting sensitive credentials or personal data in public issues.
+
+---
+
+## Response
+
+We review new issues regularly and will:
+1. confirm the report
+2. investigate the problem
+3. release a fixed version or publish mitigation steps if needed