docs: Add SECURITY.md for vulnerability reporting guidelines (#232)

Co-authored-by: James Newman <james.newman@rokt.com>

Author: thomson-t

SECURITY.md

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+# Security Policy
+
+## Reporting a vulnerability
+
+To avoid abuse by malicious actors please do not open GitHub issues or pull requests for any security related issue you may have spotted.
+
+The safest way to report any vulnerability or concern you may have is via our [dedicated submission form](https://www.rokt.com/vulnerability-disclosure/).
+
+For further information please refer to the [Rokt Vulnerability Disclosure Policy](https://www.rokt.com/vulnerability-disclosure/).