chore: add a security note, #130

SECURITY.md

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+## Reporting Security Issues
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+If you believe you have found a security vulnerability, we encourage you to let the Maintainer know right away.
+
+They will investigate all legitimate reports and do our best to quickly fix the problem.
+
+Email `ciatph.dev@gmail.com` to disclose any security vulnerabilities.
+
+You should receive a response within 3 business days. If for some reason you do not, please follow up via email to ensure they received your original message.
+
+Please include the requested information listed below (as much as you can provide) to help us better understand the nature and scope of the possible issue:
+
+- Type of issue (e.g. 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 the Maintainer triage your report more quickly.