Create SECURITY.md

Author: yourfavDev

SECURITY.md

@@ -0,0 +1,20 @@
+## Supported Versions
+
+| Version | Supported |
+| ------- | --------- |
+| 5.1.x   | ✅         |
+| 5.0.x   | ❌         |
+| 4.0.x   | ✅         |
+| < 4.0   | ❌         |
+
+## Reporting a Vulnerability
+
+Found something? Please:
+1. Open an issue
+2. Tell us:
+   - Affected version(s)
+   - A short description
+   - Steps to reproduce (or a tiny PoC)  
+3. We’ll ack your report within 48 hours and aim to have a fix out in the next patch release.
+
+Thanks for helping keep things safe!