Create SECURITY.md (#54)

Signed-off-by: Nathaniel Starkman <nstarman@users.noreply.github.com>

Author: nstarman

SECURITY.md

@@ -0,0 +1,12 @@
+# Security Policy
+
+## Supported Versions
+
+The most recent major version will receive security updates. Older major
+versions will be updated if backports are possible.
+
+## Reporting a Vulnerability
+
+To report a vulnerability, please raise an Issue or contact us directly. Fixed
+vulnerabilities will result in a bugfix, minor, or major version release,
+depending on what the fix requires.