SPRINGFIELD — Brian Vukadinovich was a teacher by trade. But when his teaching job was taken away from him, he became a pro se plaintiff, winning a case that would gain attention from well-known legal experts — like retired U.S. 7th Circuit Court of Appeals judge Richard A. Posner.Vukadinovich represented himself during a weeklong trial that ended i at the U.S. District Court in Hammond, Ind. with the jury awarding him $203,840 in damages. Now, he is writing about his experience in his recently released book …