chore: `hello_world' example, add default trace value for bezier path

examples/hello_world.rs

@@ -0,0 +1,67 @@
+use bevy::{math::DVec2, prelude::*};
+use bevy_vello_graphics::prelude::*;
+
+fn main() {
+    App::new()
+        // Bevy plugins
+        .add_plugins(DefaultPlugins)
+        // Custom Plugins
+        .add_plugins(VelloGraphicsPlugin)
+        .add_systems(Startup, (setup, render_shapes))
+        .run();
+}
+
+fn setup(mut commands: Commands) {
+    commands.spawn(Camera2dBundle::default());
+}
+
+fn render_shapes(mut commands: Commands) {
+    // Line
+    let line = (
+        VelloLine::new(DVec2::new(0.0, 100.0), DVec2::new(0.0, -100.0)),
+        Stroke::new(5.0).with_color(Color::WHITE),
+        Transform::from_xyz(-300.0, 0.0, 0.0),
+    );
+
+    // Rectangle
+    let rect = (
+        VelloRect::new(100.0, 200.0),
+        Fill::new().with_color(Color::ORANGE),
+        Stroke::new(5.0).with_color(Color::RED),
+        Transform::from_xyz(-100.0, 0.0, 0.0),
+    );
+
+    // Circle
+    let circle = (
+        VelloCircle::new(50.0),
+        Fill::new().with_color(Color::YELLOW_GREEN),
+        Stroke::new(5.0).with_color(Color::DARK_GREEN),
+        Transform::from_xyz(100.0, 0.0, 0.0),
+    );
+
+    let mut bez_path = kurbo::BezPath::new();
+    bez_path.move_to((300.0, 100.0));
+    bez_path.curve_to((200.0, 50.0), (400.0, -50.0), (300.0, -100.0));
+
+    // Beizer Path
+    let beizer_path = (
+        VelloBezPath::new().with_path(bez_path),
+        Stroke::new(4.0).with_color(Color::YELLOW),
+    );
+
+    commands
+        .spawn(VelloSceneBundle::default())
+        .insert(line);
+
+    commands
+        .spawn(VelloSceneBundle::default())
+        .insert(rect);
+
+    commands
+        .spawn(VelloSceneBundle::default())
+        .insert(circle);
+
+    commands
+        .spawn(VelloSceneBundle::default())
+        .insert(beizer_path);
+}

src/bezpath.rs

@@ -12,7 +12,7 @@ pub struct VelloBezPath {
 
 impl VelloBezPath {
     pub fn new() -> Self {
-        Self::default()
+        Self::default().with_trace(1.0)
     }
 
     pub fn with_path(mut self, path: kurbo::BezPath) -> Self {