Chore: create SECURITY.md (#258)

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| :-----: | :----------------: |
+|   2.x   | :white_check_mark: |
+|   1.x   | :x: |
+
+## Reporting a Vulnerability
+
+If you believe you have found a security vulnerability in this repository, please report it to me through coordinated disclosure.
+
+**Please do not report security vulnerabilities through public GitHub issues, discussions, or pull requests.**
+
+Instead, please send an email to xjasonlyu[@]gmail.com.
+
+Please include as much of the information listed below as you can to help me better understand and resolve the issue:
+
+  * The type of issue (e.g., buffer overflow, payload attack)
+  * 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.