feat: quad shadows

core/src/shadow.rs

@@ -0,0 +1,15 @@
+//! Shadow
+use crate::{Color, Vector};
+
+/// A shadow
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct Shadow {
+    /// The color of the shadow
+    pub color: Color,
+
+    /// The offset of the shadow
+    pub offset: Vector,
+
+    /// The blur_radius of the shadow
+    pub blur_radius: f32,
+}