first commit

ui/src/Main.java

@@ -0,0 +1,25 @@
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+
+public final class Main {
+
+    private Main() {
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            try {
+                UIManager.setLookAndFeel(
+                    UIManager.getSystemLookAndFeelClassName()
+                );
+            } catch (Exception exception) {
+                System.err.println(
+                    "No se pudo cargar el tema del sistema."
+                );
+            }
+
+            MainWindow window = new MainWindow();
+            window.setVisible(true);
+        });
+    }
+}