Create SECURITY.md (#2765)

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 9.0.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+We encourage responsible disclosure of security vulnerabilities. If you believe you have found a security vulnerability in this project, please report it via the [Security Tab](https://github.com/dolanmiu/docx/security/advisories)
+
+Please include the following information in your report:
+
+* A description of the vulnerability
+* Steps to reproduce the vulnerability
+* Impact of the vulnerability
+
+We will investigate all reported vulnerabilities and take appropriate action.
+
+We appreciate your help in keeping this project secure.