add ShapeApp class to test my shape editor.

src/main/java/shape/tp5/ShapeApp.java

+package shape.tp5;
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.layout.Pane;
+import javafx.stage.Stage;
+
+public class ShapeApp extends Application {
+
+    @Override
+    public void start(Stage primaryStage) {
+        Drawer drawer = new Drawer(400, 400);
+
+        Circle circle1 = new Circle(100, 100, 50);
+        Circle circle2 = new Circle(300, 300, 60);
+        Rectangle rectangle = new Rectangle(150, 150, 100, 80);
+
+        drawer.add(circle1);
+        drawer.add(circle2);
+        drawer.add(rectangle);
+
+        Pane root = new Pane();
+        root.getChildren().add(drawer);
+
+        Scene scene = new Scene(root, 400, 400);
+        primaryStage.setTitle("Éditeur de formes");
+        primaryStage.setScene(scene);
+        primaryStage.show();
+    }
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+}