Create SECURITY.md

Author: BenWinchester

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+All users of CLOVER are recommended to transfer over to a version greater than, or equal to, `v5.0.x`. Older versions will not be maintained or supported.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 5.1.x   | :heavy_check_mark: |
+| 5.0.x   | :heavy_check_mark: |
+| 4.0.x   | :x:                |
+| < 4.0   | :x:                |
+
+## Reporting a Vulnerability
+
+If you discover a vulnerability in CLOVER, report it to the development team within the [CLOVER-energy organisation](https://github.com/CLOVER-energy).