Addition of custom rules

Hi Team,

I want to add some custom rules in the bugs/code smells. Can you please share what is the process?

Also, i don't see any rules for vulnerabilities and Security hotspots. How to get them ?

<img width="152" alt="Sonar Groovy" src="https://github.com/user-attachments/assets/3a86856a-515e-406d-b003-7edc536ba3f5">

