Create SECURITY.md

Author: ProgrammerKR

SECURITY.md

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+# Security Policy  
+
+## Supported Versions  
+
+The following table lists the versions of HashX that currently receive security updates:  
+
+| Version | Supported          |  
+| ------- | ------------------ |  
+| 5.1.x   | ✅ Supported       |  
+| 5.0.x   | ❌ Not Supported  |  
+| 4.0.x   | ✅ Supported       |  
+| < 4.0   | ❌ Not Supported  |  
+
+We recommend using the latest supported versions to ensure security and stability.  
+
+## Reporting a Vulnerability  
+
+If you discover a security vulnerability in HashX, please follow these guidelines to report it responsibly:  
+
+1. **Contact:** Submit vulnerability reports via [GitHub Issues](https://github.com/ProgrammerKR/HashX/issues) or email at `programmerkr.123@gmail.com`.  
+2. **Provide Details:** Clearly describe the issue, including steps to reproduce it, affected versions, and potential security impact.  
+3. **Response Time:** We aim to acknowledge reports within **48 hours** and provide updates on our progress within **7 days**.  
+4. **Disclosure Process:**  
+   - If the vulnerability is confirmed, we will work on a fix and release an update.  
+   - You will be credited for responsible disclosure unless anonymity is requested.  
+5. **Public Disclosure:** To protect users, please do not publicly disclose vulnerabilities before a fix is released.  
+
+For general security-related questions, feel free to reach out via GitHub.