simple black window with Q key to exit

src/main.rs

@@ -2,51 +2,16 @@ use bevy::prelude::*;
 
 fn main() {
     App::new()
-        .add_plugins((DefaultPlugins, HelloPlugin))
+        .add_systems(Update, handle_input)
+        .add_plugins((DefaultPlugins, ))
         .run();
 }
 
-#[derive(Resource)]
-struct GreetTimer(Timer);
-
-#[derive(Component)]
-struct Name(String);
-
-#[derive(Component)]
-struct Person;
-
-fn add_people(mut commands: Commands) {
-    commands.spawn((Person, Name("Elaina Proctor".to_string())));
-    commands.spawn((Person, Name("Renzo Hume".to_string())));
-    commands.spawn((Person, Name("Zayna Nieves".to_string())));
-}
-
-fn update_people(mut query: Query<&mut Name, With<Person>>) {
-    for mut name in &mut query {
-        if name.0 == "Elaina Proctor" {
-            name.0 = "Elaina Hume".to_string();
-            break;
-        }
-    }
-}
-
-fn greet_people(query: Query<&Name, With<Person>>, time:Res<Time>, mut timer: ResMut<GreetTimer>) {
-    if timer.0.tick(time.delta()).just_finished() {
-        for name in &query {
-            println!("hello {}!", name.0);
-        }
-    }
-}
-
-fn hello_world() {
-    println!("hello world!");
-}
-
-pub struct HelloPlugin;
-impl Plugin for HelloPlugin {
-    fn build(&self, app: &mut App) {
-        app.insert_resource(GreetTimer(Timer::from_seconds(2.0, TimerMode::Repeating)))
-            .add_systems(Startup, add_people)
-            .add_systems(Update, (hello_world, (update_people, greet_people).chain()));
+fn handle_input(
+    keyboard_input: Res<ButtonInput<KeyCode>>,
+    mut app_exit_events: ResMut<Events<bevy::app::AppExit>>
+) {
+    if keyboard_input.pressed(KeyCode::KeyQ) {
+        app_exit_events.send(bevy::app::AppExit);
     }
 }