feat: added examples to the repo

examples/hello_world.rs

@@ -0,0 +1,17 @@
+use comet::prelude::*;
+
+// This function will only be called once before the event loop starts.
+fn setup(app: &mut App, renderer: &mut Renderer2D) {}
+
+// This function will be called on every tick after the event loop starts.
+fn update(app: &mut App, renderer: &mut Renderer2D, dt: f32) {}
+
+fn main() {
+	// This creates a window with the title "Hello world".
+	// Note: You can call your functions differently if you want to though it is advised to use
+	// `setup` and `update` as the names.
+	// You can also replace `Renderer2D` with any other struct that implements the `Renderer` trait.
+	App::new()
+		.with_title("Hello world")
+		.run::<Renderer2D>(setup, update);
+}