RMI callback for manage the invitations

Commons/src/interfaces/INotificationClient.java

@@ -0,0 +1,15 @@
+package interfaces;
+
+import models.Response;
+
+import javax.swing.*;
+import java.rmi.Remote;
+import java.rmi.RemoteException;
+
+/**
+ * Created by loke on 19/06/2017.
+ */
+public interface INotificationClient extends Remote{
+
+        Response sendInvite(String userName, DefaultListModel<String> users) throws RemoteException;
+}