add method draw(GraphicsContext graphicsContext)

src/main/java/shape/AbstractShape.java

 package shape;
 
 import javafx.geometry.Point2D;
-
 import java.util.ArrayList;
 import java.util.List;
+import javafx.scene.canvas.GraphicsContext;
 
 public abstract  class AbstractShape implements Shape {
     private List<Point2D> points = new ArrayList<>();
@@ -20,4 +20,6 @@ public abstract  class AbstractShape implements Shape {
         return points.get(index);
     }
 
+    public abstract void draw(GraphicsContext graphicsContext);
+
 }