Lightyear setup (#55)

crates/shared/src/utils/commands.rs

@@ -0,0 +1,21 @@
+use bevy::ecs::{
+    bundle::Bundle, resource::Resource, system::EntityCommands, world::EntityWorldMut,
+};
+
+#[derive(Default, Resource)]
+pub struct IsServer;
+
+pub trait CommandExt {
+    fn insert_server(&mut self, bundle: impl Bundle) -> &mut Self;
+}
+
+impl<'w> CommandExt for EntityCommands<'w> {
+    fn insert_server(&mut self, bundle: impl Bundle) -> &mut Self {
+        self.queue(|mut entity: EntityWorldMut| {
+            if entity.world().contains_resource::<IsServer>() {
+                entity.insert(bundle);
+            }
+        });
+        self
+    }
+}