docs: plane type and reference

docs/cientos/shapes/plane.md

@@ -4,6 +4,11 @@
 
 The `cientos` package provides a `<Plane />` component that serves as a short-cut for a `PlaneGeometry` and a `MeshBasicMaterial` with a `Mesh` object.
 
+```typescript
+args: [width: number, height: number, widthSegments: number, heightSegments: number]
+```
+reference: [PlaneGeometry](https://threejs.org/docs/?q=plane#api/en/geometries/PlaneGeometry)
+
 ::: info
 A convenient default rotation is applied to the _x-axis_ of the plane (`-Math.PI / 2`), so that it is facing up (along the Y axis).
 :::