feat: adding lesson 12 Linked List Games again

Author: haldanek

lesson_12/structs_java/structs_app/src/main/java/com/codedifferently/lesson12/Lesson12.java

@@ -93,3 +93,4 @@ public static void main(String[] args) {
     System.out.println("Team with most high-value pairs: " + winningTeam);
   }
 }
+}