Add SECURITY.md

Author: williamdes

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.2.x.x | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+Please email vulnerability reports to `williamdes@wdes.fr` with the header starting with `[sudo-bot/docker-phpldapadmin@security]`
+
+Vulnerabilities in the code should get updates right away.