Added student list to Administration class

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

@@ -6,11 +6,14 @@ import java.util.List;
 public class Administration {
     private List<Professor> professors;
     private List<Admin> admins;
+    private List<Student> students;
 
     public Administration()
     {
         this.professors = new ArrayList<>();
         this.admins = new ArrayList<>();
+        this.students = new ArrayList<>();
+
     }