feat: add JavaFX application launcher

src/main/java/com/university/chat/Client/UI/Launcher.java

@@ -0,0 +1,9 @@
+package com.university.chat.Client.UI;
+import javafx.application.Application;
+
+public class Launcher{
+    public static void main(String[] args) {
+
+        Application.launch(ChatApp.class);
+    }
+}