feat: add gravity and gravity-movement plugins

Add CHGravityPlugin to manage the global gravity resource and
CHGravityMovementGluePlugin to apply gravity to movement velocity
each fixed update. Update workspace dependencies and include the
new crates in the main app.

1 files changed, 12 insertions, 0 deletions

diff --git a/plugins/gravity/src/gravity.rs b/plugins/gravity/src/gravity.rs
new file mode 100644
index 0000000..6d7030c
--- /dev/null
+++ b/plugins/gravity/src/gravity.rs
@@ -0,0 +1,12 @@
+use bevy::{
+    ecs::resource::Resource,
+    math::Vec3,
+    prelude::{Deref, DerefMut},
+};
+
+/// Represents the global gravity
+#[derive(Resource, Deref, DerefMut, PartialEq, Default, Clone)]
+pub struct Gravity {
+    #[deref]
+    pub(crate) gravity: Vec3,
+}