Add SECURITY.txt

Signed-off-by: Bryan Frimin <bryan@frimin.fr>

SECURITY.txt

@@ -0,0 +1,26 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+If you believe you have found a security vulnerability in this
+project, please report it to us by emailing
+[security@getprobo.com](security@getprobo.com).
+
+Please include:
+- A description of the issue
+- Steps to reproduce (if possible)
+- The affected version(s)
+
+Do not create public GitHub issues for security vulnerabilities.
+
+## Response Process
+
+- We'll acknowledge your report within 48 hours
+- We'll provide updates as we investigate
+- Once fixed, we'll notify you and publish an update
+
+## Supported Versions
+
+Only the latest version receives security updates.
+
+Last updated: 2025-01-10