add polar_zonohedra

docs/lib3x-polyhedra_polar_zonohedra.md

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+# octahedron
+
+Creates a [polar zonohedra](https://mathworld.wolfram.com/PolarZonohedron.html).
+
+**Since:** 3.2
+
+## Parameters
+
+- `n` : n equal rhombs surrounding one vertex. (rotational symmetry)
+- `theta` : the pitch angle of the edges.
+
+## Examples
+
+	use <polyhedra/polar_zonohedra.scad>;
+
+	for(n = [3:8]) {
+		translate([0.5 * n * (n - 3), 0, 0])
+			polar_zonohedra(n);
+	}
+
+![polar_zonohedra](images/lib3x-polyhedra_polar_zonohedra-1.JPG)
+