Fixed structure of UI, Added some logic to Auth

src/main/java/ui/HomePanel.java

@@ -0,0 +1,30 @@
+package ui;
+
+import models.User;
+import util.Session;
+
+import javax.swing.*;
+import java.util.function.Consumer;
+
+public class HomePanel extends BasePanel {
+
+    public HomePanel(Consumer<String> changePanel) {
+        super(changePanel);
+
+        User user = Session.getInstance().getUser();
+        if (user == null) {
+            // Log, user is not logged.
+            changePanel.accept("auth");
+        }
+
+
+        JButton logoutButton = new JButton("Logout");
+        logoutButton.addActionListener(e -> {
+            Session.getInstance().logout();
+            changePanel.accept("auth");
+        });
+
+        add(logoutButton);
+    }
+
+}