ci: Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+Only the latest version of the SDK is supported.
+
+## Reporting a Vulnerability
+
+To report a security concern, use the "[Report a Vulnerability](https://github.com/Vonage/vonage-kotlin-sdk/security/advisories/new)" tab.
+You can also contact the Developer Relations team directly via [email](devrel@vonage.com] for more private disclosure.
+You can also [raise an Issue](https://github.com/Vonage/vonage-kotlin-sdk/issues/new/choose) and/or create a [Pull Request](https://github.com/Vonage/vonage-kotlin-sdk/pulls) from your fork of the repo.
+Please include as much detail as possible, an indication of severity and, ideally, a minimal reproducible example to demonstrate the issue if possible.