Create SECURITY.md

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+This section lists the versions of the "Clang-Format Code Style Action for C++" project that are currently being supported with security updates. It's important to use supported versions to ensure the security of your project.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+If you believe you have found a security vulnerability in the "Clang-Format Code Style Action for C++", we encourage you to report it as soon as possible. Please follow these steps:
+
+1. **Do Not Publicly Disclose**: Do not disclose the vulnerability publicly or to any third parties. Public disclosure can put the entire community at risk.
+2. **Report Privately**: Send your vulnerability report privately to [insert your preferred contact method - could be an email address, a secure form, etc.]. Please provide as much information about the vulnerability as possible, including steps to reproduce, potential impact, and suggested mitigation or remediation if available.
+3. **Response Timeline**: Our maintainers take security seriously and will respond promptly, typically within 72 hours. We will review your report and work with you to understand and resolve the issue quickly.
+4. **Acknowledgment**: If you wish, we will publicly acknowledge your responsible disclosure in our project updates, unless you prefer to remain anonymous.
+5. **Updates on Resolution**: We will keep you informed about the progress of resolving the security issue you have reported.
+
+Remember, security is a top priority for us, and we appreciate your help in keeping our community safe. Thank you for your contribution to the security of the "Clang-Format Code Style Action for C++" project.
+
+---
+
+Contributions to improve this action are always welcome! Feel free to open issues or submit pull requests for general improvements as well.