added SECURITY.md

SECURITY.md

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+# Security Policy
+
+<!--
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version    | Supported          |
+| ---------- | ------------------ |
+| 0.11.0     | :white_check_mark: |
+| <= 0.10.0  | :x:                |
+-->
+
+## Reporting a Vulnerability
+
+<!--
+Use this section to tell people how to report a vulnerability.
+
+Tell them where to go, how often they can expect to get an update on a
+reported vulnerability, what to expect if the vulnerability is accepted or
+declined, etc.
+-->
+
+If you discover a vulnerability, please send a PGP encrypted email with details to [erik@bjareho.lt](mailto:erik@bjareho.lt) (preferably PGP encrypted using [this key](https://erik.bjareholt.com/erikbjare.asc)).