Split title screen into it's own mod & Plugin

src/title_screen.rs

@@ -0,0 +1,44 @@
+use crate::GameState;
+
+use bevy::prelude::*;
+
+pub struct GameMenuPlugin;
+
+impl Plugin for GameMenuPlugin {
+	fn build(&self, app: &mut App){
+		app
+			.add_systems(OnEnter(GameState::TitleScreen), spawn_menu)
+			.add_systems(OnExit(GameState::TitleScreen), despawn_menu);
+	}
+}
+
+// Marker component for the title screen UI entity.
+// This way, a query for the TitleUI can be used to despawn the title screen
+#[derive(Component)]
+struct TitleUI;
+
+fn spawn_menu(mut commands: Commands) {
+	commands.spawn(Camera2d);
+    commands
+        .spawn((
+            TitleUI,
+            Node {
+                flex_direction: FlexDirection::Column,
+                ..Default::default()
+            },
+        ))
+        .with_children(|cmds| {
+            cmds.spawn((
+                Text::new("Robert's Bad Asteroids Game"),
+                TextFont::from_font_size(50.0),
+            ));
+            cmds.spawn((
+                Text::new("Press space to begin"),
+                TextFont::from_font_size(40.0),
+            ));
+        });
+}
+
+fn despawn_menu() {
+	todo!();
+}