Add SECURITY.md

Author: lberrymage

SECURITY.md

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+<!--
+Copyright 2023-2024 Logan Magee
+
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+# Security Policy
+
+## Supported Versions
+
+Only the latest version of this project is supported.
+
+## Reporting a vulnerability
+
+If you have a vulnerability to report, please email <security@accrescent.app> or DM Logan Magee on
+Matrix @lberrymage:matrix.org if you want end-to-end encryption.