Create SECURITY.md

Author: derenv

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Until a stable release is created, security patches will be applied on an ad-hoc basis.
+
+## Reporting a Vulnerability
+
+Create an issue [here](https://github.com/derenv/gtk4-nvidia-monitor-rust/issues/new/choose) using the "Report a security vulnerability" option - this ensures the report is easier to read and more likely to be accepted.
+
+We will be trying to remediate all security issues, but if required we can change crates used to avoid insecure packages. Any vulnerability report will be seriously considered and it's *extremely* unlikely they will be rejected.