create the interface

src/main/java/org/example/shared/IQuizService.java

+package org.example.shared;
+
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+
+
+public interface IQuizService extends Remote {
+
+    public String getRandomQuestion() throws RemoteException;
+
+    public String submitAnswer(String studentName, String answer) throws RemoteException;
+
+    public String getLeaderboard() throws RemoteException;
+
+    public String authenticateStudent(String studentName) throws RemoteException;
+}
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