Added functionality to the signup button

src/main/java/LoginGUI.java

@@ -71,6 +71,10 @@ public class LoginGUI extends JFrame implements ActionListener {
     public void actionPerformed(ActionEvent e) {
         if (e.getSource() == loginButton) {
             login();
+        }else if (e.getSource() == signUpButton) {
+            SignUpGUI signUpGUI = new SignUpGUI();
+            signUpGUI.setVisible(true);
+            
         }
     }
 

user.json

@@ -19,5 +19,12 @@
     "password": "Test",
     "birthday": "01.01.2000",
     "stayLoggedIn": false
+  },
+  {
+    "id": "57b7fb2e-50c1-4027-8871-58cbfc8405c8",
+    "userName": "New",
+    "password": "123456",
+    "birthday": "",
+    "stayLoggedIn": false
   }
 ]