chore: add security policy

.gitattributes

@@ -3,15 +3,18 @@
 /.gitattributes             export-ignore
 /.github/                   export-ignore
 /.gitignore                 export-ignore
-/CODE_OF_CONDUCT.md         export-ignore
-/CONTRIBUTING.md            export-ignore
 /build/                     export-ignore
 /captainhook.json           export-ignore
+/CHANGELOG.md               export-ignore
+/CODE_OF_CONDUCT.md         export-ignore
 /composer.lock              export-ignore
+/CONTRIBUTING.md            export-ignore
 /conventional-commits.json  export-ignore
 /phpcs.xml.dist             export-ignore
 /phpstan.neon.dist          export-ignore
 /phpunit.xml.dist           export-ignore
 /psalm-baseline.xml         export-ignore
 /psalm.xml                  export-ignore
+/SECURITY.md                export-ignore
+/SECURITY.md.sig            export-ignore
 /tests/                     export-ignore

SECURITY.md

@@ -0,0 +1,95 @@
+# Security Policy
+
+I, Ben Ramsey, take the security of my software products and services seriously, which includes all source code repositories managed through my GitHub account, [@ramsey](https://github.com/ramsey).
+
+If you believe you have found a security vulnerability in any repository I own, please report it to me as described below.
+
+## Reporting Security Issues
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+Instead, please report them to me via <security@ramsey.dev>. If possible, encrypt your message with my PGP encryption key, provided below.
+
+You should receive a response within 14 days. If for some reason you do not, please follow up via email to ensure I received your original message.
+
+Please include the requested information listed below (as much as you can provide) to help me better understand the nature and scope of the possible issue:
+
+  * Product version containing the issue
+  * Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting, etc.)
+  * Full paths of source file(s) related to the manifestation of the issue
+  * The location of the affected source code (tag/branch/commit or direct URL)
+  * Any special configuration required to reproduce the issue
+  * Step-by-step instructions to reproduce the issue
+  * Proof-of-concept or exploit code (if possible)
+  * Impact of the issue, including how an attacker might exploit the issue
+
+This information will help me triage your report more quickly.
+
+## Preferred Languages
+
+I prefer all communications in English.
+
+## Policy
+
+I follow the [Coordinated Vulnerability Disclosure](https://vuls.cert.org/confluence/display/CVD/The+CERT+Guide+to+Coordinated+Vulnerability+Disclosure) process.
+
+## Encryption Key for `security@ramsey.dev`
+
+For increased privacy when reporting sensitive issues, you may encrypt your message using the key below:
+
+```
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+-----END PGP PUBLIC KEY BLOCK-----
+```