Entity structure

examples/cube.rs

@@ -1,4 +1,19 @@
+use osmium::entity::Component;
+
+pub struct Velocity(pub i32);
+
+impl Component for Velocity {
+    fn tick(&mut self) {}
+}
+
 fn main() {
     let mut engine = osmium::init();
-    engine.thread("Main.event", move || {});
+
+    engine.thread("Main.tick", || {});
+
+    let mut my_rect = engine.draw(|r| {
+        // r.draw_rect(0, 0, 10, 10);
+    });
+
+    my_rect.component(Velocity(10));
 }