Create SECURITY.md

Hi there! Happy new year! I am Jiacheng Zhong, a security researcher, currently affliated with Johns Hopkins University, you can call me Gavin. Me and my collaborator identified a highly severe vulnerability in django-unicorn, which impacts all versions application and easily exploitable, leading to stored XSS attack.

Author: superboy-zjc

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The following versions of Django Unicorn are currently supported for security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.61.x  | ✅ Fully supported |
+
+Please ensure you are using the latest version to receive security updates.
+
+---
+
+## Reporting a Vulnerability
+
+We take security issues seriously and appreciate your efforts to responsibly disclose vulnerabilities.
+
+To report a security vulnerability:
+
+1. **Use our GitHub Security Advisory**:
+   - Navigate to the [Django Unicorn repository](https://github.com/adamghill/django-unicorn).
+   - Go to the **Security** tab and click **Report a vulnerability**.
+2. **Responsible Disclosure**:
+   - Do not publicly disclose the vulnerability until we have had a chance to investigate and provide a fix.
+   - We aim to respond to security reports within **48 hours** and provide a resolution within **7-14 days**.
+  
+---
+
+## Acknowledgments
+
+We appreciate the contributions of security researchers and developers who help us make Django Unicorn secure. Thank you for your support in keeping this project safe and reliable.