cargo add bevy-progressbar

fn setup(mut commands: Commands, mut materials: ResMut<Assets<ProgressBarMaterial>>) {
    let bar = ProgressBar::new(vec![(1000, Color::RED),(2000, Color::BLUE),(4000, Color::GREEN)]);
    let style = Style {
        position_type: PositionType::Absolute,
        width: Val::Px(400.0),
        height: Val::Px(200.0),
        top: Val::Px(400.0),
        ..bevy_utils::default()
    };
    commands.spawn(
        ProgressBarBundle::new(style, bar, &mut materials);
    );
}