chore: add SECURITY.md with vulnerability disclosure contact

Author: Chace-Berry

SECURITY.md

@@ -0,0 +1,25 @@
+# Security Policy
+
+## Supported Versions
+
+| Version | Supported |
+| ------- | --------- |
+| 1.4.x   | Yes       |
+| 1.3.x   | No        |
+| < 1.3   | No        |
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability in `alterion-encrypt`, **please do not open a public GitHub issue.**
+
+Report it privately by emailing:
+
+**chaceberry686@gmail.com**
+
+Please include:
+- A description of the vulnerability
+- Steps to reproduce or a proof-of-concept
+- The version(s) affected
+- Any potential impact or severity assessment
+
+You can expect an acknowledgement within **72 hours**. We will work with you to understand and resolve the issue, and will coordinate a disclosure timeline.