add missing files

Signed-off-by: Schmarni <marnistromer@gmail.com>

crates/bevy_openxr/src/openxr/action_set_attaching.rs

@@ -0,0 +1,36 @@
+use crate::resources::OxrSession;
+use bevy::prelude::*;
+use bevy_xr::session::status_changed_to;
+
+impl Plugin for OxrActionAttachingPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_event::<OxrAttachActionSet>();
+        app.add_systems(
+            PostUpdate,
+            attach_sets.run_if(status_changed_to(bevy_xr::session::XrStatus::Ready)),
+        );
+    }
+}
+
+fn attach_sets(session: Res<OxrSession>, mut events: EventReader<OxrAttachActionSet>) {
+    let sets = events.read().map(|v| &v.0).collect::<Vec<_>>();
+    match session.attach_action_sets(&sets) {
+        Ok(_) => {}
+        Err(openxr::sys::Result::ERROR_ACTIONSETS_ALREADY_ATTACHED) => {
+            error!("Action Sets Already attached!");
+        }
+
+        Err(openxr::sys::Result::ERROR_HANDLE_INVALID) => error!("Invalid ActionSet Handle!"),
+        Err(e) => error!(
+            "Unhandled Error while attaching action sets: {}",
+            e.to_string()
+        ),
+    };
+}
+
+#[derive(Event, Clone)]
+/// Send this event for every ActionSet you want to attach to the [`OxrSession`] once the Session Status changed to Ready. all requests will
+/// be applied in [`PostUpdate`]
+pub struct OxrAttachActionSet(pub openxr::ActionSet);
+
+pub struct OxrActionAttachingPlugin;