Adding new courses List in Administration class

src/main/java/org/example/Administration.java

@@ -11,6 +11,7 @@ public class Administration {
     private List<Professor> professors;
     private List<Admin> admins;
     private List<Student> students;
+    private List<Course> courses;
     Scanner scanner = new Scanner(System.in);
 
     /**
@@ -21,6 +22,7 @@ public class Administration {
         this.professors = new ArrayList<>();
         this.admins = new ArrayList<>();
         this.students = new ArrayList<>();
+        this.courses = new ArrayList<>();
 
     }