add 'OWASP Threat Dragon'

- signed-off-by: trimstray <trimstray@gmail.com>

README.md

@@ -1245,6 +1245,7 @@ CyberTalks</b></a> - talks, interviews, and article about cybersecurity.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/TH3xACE/SUDO_KILLER"><b>SUDO_KILLER</b></a> - is a tool to identify and exploit sudo rules' misconfigurations and vulnerabilities.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/VirusTotal/yara"><b>yara</b></a> - the pattern matching swiss knife.<br>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/gentilkiwi/mimikatz"><b>mimikatz</b></a> - a little tool to play with Windows security.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://owasp.org/www-project-threat-dragon/"><b>OWASP Threat Dragon</b></a> - is a tool used to create threat model diagrams and to record possible threats.<br>
 </p>
 
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