Fixed structure of UI, Added some logic to Auth

src/main/java/ui/BasePanel.java

@@ -0,0 +1,13 @@
+package ui;
+
+import javax.swing.*;
+import java.util.function.Consumer;
+
+public abstract class BasePanel extends JPanel {
+    protected Consumer<String> changePanel;
+
+    public BasePanel(Consumer<String> changePanel) {
+        this.changePanel = changePanel;
+    }
+}
+