chore: add security policy (#124)

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+|---------|--------------------|
+| 4.x     | :white_check_mark: |
+| 3.x     | :white_check_mark: |
+| < 3.0   | :x:                |
+
+## Reporting a Vulnerability
+
+To report a security vulnerability in this package, please send an email to [@darrachequesne](https://github.com/darrachequesne) (see address in profile) describing the vulnerability and how to reproduce it.
+
+We will get back to you as soon as possible and publish a fix if necessary.
+
+:warning: IMPORTANT :warning: please do not create an issue in this repository, as attackers might take advantage of it. Thank you in advance for your responsible disclosure.
+
+## History
+
+| Date         | Description                                                                                                   | CVE number     |
+|--------------|---------------------------------------------------------------------------------------------------------------|----------------|
+| January 2021 | [Resource exhaustion in socket.io-parser](https://github.com/advisories/GHSA-xfhh-g9f5-x4m4)                  | CVE-2020-36049 |
+| October 2022 | [Insufficient validation when decoding a Socket.IO packet](https://github.com/advisories/GHSA-qm95-pgcg-qqfq) | CVE-2022-2421  |
+| May 2023     | [Insufficient validation when decoding a Socket.IO packet](https://github.com/advisories/GHSA-cqmj-92xf-r6r9) | CVE-2023-32695 |