Simple example

Main.hx

import flash.display.Sprite;


class Main extends Sprite {
  
	
	public function new () {
		
		super ();
		
		var sprite = new Sprite ();
		sprite.graphics.beginFill (0xFF0000);
		sprite.graphics.drawRect (0, 0, 100, 100);
		addChild (sprite);
		
		sprite.x = 100;
		sprite.y = 100;
		
	}
	
	
}

project.hxml

<?xml version="1.0" encoding="utf-8"?>
<project>
  
	<meta title="Example" package="com.example.testing" version="1.0.0" company="Joshua Granick" />
	<app main="Main" path="Export" file="Example" />
	
	<source path="Source" />
	
	<haxelib name="openfl" />
	
</project>