Cook County Circuit Judge Diane M. Shelley, installed last week as president of the Illinois Judges Association, said she views her new role as a public service.“It’s a big responsibility. We have some great judges. And to be the leader, the president of an organization that has such members, makes you rise to the challenge,” Shelley said in an interview.“But I’d like to simplify it. Basically, I’m just a public servant. My role as president of the Illinois Judges Association is just an extension of my role as a judge, and …