Create SECURITY.md

Author: Moderocky

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Security vulnerabilities will be retroactively patched on the last **three** medium versions (1.**X**.0).
+This will require users to redownload (or rebuild) the affected version.
+
+## Reporting a Vulnerability
+
+For minor vulnerabilities, issues can be made on the GitHub.
+For more serious vulnerabilites, please make direct private contact with any organisation member.