update SECURITY.md (#31)

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SECURITY.md

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+
+# Security policy
+
+
+## Reporting a vulnerability
+To report a security issue, file a [Private Security Report](https://github.com/canonical/charm-juju-local/security/advisories/new)
+with a description of the issue, the steps you took to create the issue, affected versions, and,
+if known, mitigations for the issue.
+
+The [Ubuntu Security disclosure and embargo policy](https://ubuntu.com/security/disclosure-policy)
+contains more information about what you can expect when you contact us and what we expect from you.