docs: Create SECURITY.md

Author: Stranger6667

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+`css-inline` provides security updates only for the latest minor version.
+
+## Reporting a Vulnerability
+
+To report a security vulnerability in `css-inline`:
+
+1. Email your findings to [email protected].
+2. Provide a detailed description of the vulnerability and steps to reproduce it.
+3. If possible, include a suggested fix or mitigation.
+
+You can expect an initial response within a few days of your report.
+
+## Disclosure Policy
+
+There is no formal process for disclosing fixed vulnerabilities. Updates will be released as part of regular patch versions, and significant security fixes will be noted in the release notes.
+
+Thank you for helping keep `css-inline` and its users safe!