Add security policy link to readme

Author: per1234

README.md

@@ -78,6 +78,14 @@ This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 ```
 
+### Security
+
+If you think you found a vulnerability or other security-related bug in this project, please read our
+[security policy](https://github.com/arduino/arduino-builder/security/policy) and report the bug to our Security Team 🛡️
+Thank you!
+
+e-mail contact: security@arduino.cc
+
 ### License and Copyright
 
 `arduino-builder` is licensed under General Public License version 2, as published by the Free Software Foundation. See [LICENSE.txt](LICENSE.txt).