doc: Create SECURITY.md

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+This section shows which versions of eza are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| latest    | :white_check_mark: |
+| < 0.10.6  | :x:                |
+
+## Reporting a Vulnerability
+
+Please email all vulnerabilities to christina@cafkafk.com, with PGP encryption and signature, and ideally send along plaintext public key or instructions on where to find public key (keyserver etc.).