Merge pull request #40 from deephaven/security-md

docs: Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+We strongly encourage you to report potential security vulnerabilities via one of the following methods:
+
+* A private GitHub security advisory, https://github.com/deephaven/barrage/security/advisories/new
+* An email to Deephaven's private security list, [email protected]