Create SECURITY.md

Author: josecelano

SECURITY.md

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+# Security Policy
+
+Thanks for helping make Torrust Tracker safe for everyone.
+
+## Security
+
+[Torrust](https://github.com/torrust) takes the security of our software products and services seriously.
+
+## Reporting Security Issues
+
+If you believe you have found a security vulnerability in any of our repositories, please report it to us through coordinated disclosure.
+
+**Please do not report security vulnerabilities through public GitHub issues, discussions, or pull requests.**
+
+Instead, please send an email to info[@]nautilus-cyberneering.de.
+
+Please include as much of the information listed below as you can to help us better understand and resolve the issue:
+
+- The type of issue (e.g., buffer overflow, SQL injection, or cross-site scripting)
+- Full paths of source file(s) related to the manifestation of the issue
+- The location of the affected source code (tag/branch/commit or direct URL)
+- Any special configuration required to reproduce the issue
+- Step-by-step instructions to reproduce the issue
+- Proof-of-concept or exploit code (if possible)
+- Impact of the issue, including how an attacker might exploit the issue
+
+This information will help us triage your report more quickly.