Create SECURITY.md

Author: edwardsph

SECURITY.md

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+# Security policy
+
+This repository contains tests executed by the [Conformance Test Harness](https://github.com/solid-contrib/conformance-test-harness). 
+The tests are intended to assess the conformance of Solid server implementations to the specifications at https://solid.github.io/specification/.
+
+# Reporting a vulnerability
+
+If you discover a vulnerability in our code, or experience a bug related to security,
+please report it as an [issue](https://github.com/solid-contrib/specification-tests/issues).