feat: add mermaid sequence diagram

app/src/main/java/clientserver/App.java

@@ -1,6 +1,7 @@
 package clientserver;
 
 public class App {
+
     public String getGreeting() {
         return "Hello World!";
     }
@@ -8,6 +9,6 @@ public class App {
     public static void main(String[] args) {
         System.out.println(new App().getGreeting());
 
-        Server.scannerUDP(1000, 5000);
+        Server.scannerUDP(0, 5000);
     }
 }