Create SECURITY.md

Use a very basic description for now that can be improved as desired

Signed-off-by: Ryan Bottriell <[email protected]>

Author: rydrman

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+Please submit security vulnerabilities using the private reporting mechanism under the github security tab, or use [this link](https://github.com/spkenv/spk/security/advisories/new).