Revise security policy and supported versions

Updated security policy to clarify supported versions and reporting process.

Signed-off-by: Omena0 <Omena0MC@gmail.com>

Author: Omena0

SECURITY.md

@@ -0,0 +1,13 @@
+# Security Policy
+
+## Supported MC Versions
+
+I will not do backports for any reason.
+
+If you have an issue in a version that is no longer supported, backport the latest version yourself and make a pull request.
+
+## Reporting a Vulnerability
+
+DM me on discord (@Omena0), with an explanation.
+
+The scripts having system access is not a vulnerability. It is intended and will not be changed. I will not add sandboxing.