Create SECURITY.md

Resolves tkuester#97

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+As taky is a lightweight project (and also infrequently developed of late), it's
+developer(s) have decided to not offer an "LTS" release. Users should always use
+the most recent version of software.
+
+However, if you discover a vulnerability in the software, and have a special use
+case that requires an older version, we'll do our best to accomodate your needs.
+However, primary efforts will likely be directed towards the most recent
+software release.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.9     | :white_check_mark: |
+| < 0.9   | :x:                |
+
+## Reporting a Vulnerability
+
+If you have discovered a vulnerability in taky, please contact it's developers
+privately. Feel free to ping on Discord, where you will find them to be most
+responsive.
+
+However, if you prefer email, you can send an email to:
+
+tkuester <at> users.noreply.github.com