create QuizServer

src/main/java/org/example/server/QuizServer.java

+package org.example.server;
+
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+
+public class QuizServer {
+
+    public static void main(String[] args) {
+        try {
+            QuizServiceImpl quizService = new QuizServiceImpl();
+
+            Registry registry = LocateRegistry.createRegistry(1099);
+
+            registry.rebind("QuizService", quizService);
+            System.out.println("Quiz Server is running and ready...");
+
+            Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+                System.out.println("\nServer is shutting down...");
+                quizService.saveScoresToFile();
+            }));
+
+        } catch (Exception e) {
+            System.err.println("Server exception: " + e.toString());
+            e.printStackTrace();
+        }
+    }
+}
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