Add SECURITY.md file

Author: simskij

SECURITY.md

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+The easiest way to report a security issue is through a [Github Private Security Report](https://github.com/canonical/observability-libs/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.
+
+Alternatively, to report a security issue via email, please email [[email protected]](mailto:[email protected]) 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.