Element example

src/main.rs

@@ -1,10 +1,12 @@
 use minifb::{Window, WindowOptions};
-use osgui::App;
+use osgui::{elements::Rect, App};
 
 fn main() {
     let window = Window::new("minifb example", 500, 500, WindowOptions::default()).unwrap();
 
     let mut app = App::new(window);
 
+    app.element(Rect);
+
     app.run();
 }