rectangle from frame, width and height

# Feature Request

rectangle from frame (plane), width and height.
simple shape but didn't find a straight forward way to create it.

## Details

**Describe the solution you'd like**
maybe it could be included in `Polygon` class as method `Polygon.from_frame_width_height()` ?

**Describe alternatives you've considered**
i used the Box class top face
```
box = Box(some_frame, w, h, d)
top_face_pts = box.vertices[:4]
```