add doc

README.md

@@ -377,7 +377,7 @@ These examples incubate dotSCAD and dotSCAD refactors these examples. See [examp
 
  Signature | Description
 --|--
-polyhedra/star | create a 3D star.
+[**polyhedra/star**([outerRadius, innerRadius, height, n])](https://openhome.cc/eGossip/OpenSCAD/lib3x-polyhedra_star.html) | create a 3D star.
 [**polyhedra/tetrahedron**(radius[, detail])](https://openhome.cc/eGossip/OpenSCAD/lib3x-polyhedra_tetrahedron.html) | create a tetrahedron.
 [**polyhedra/hexahedron**(radius[, detail])](https://openhome.cc/eGossip/OpenSCAD/lib3x-polyhedra_hexahedron.html) | create a hexahedron.
 [**polyhedra/octahedron**(radius[, detail])](https://openhome.cc/eGossip/OpenSCAD/lib3x-polyhedra_octahedron.html) | create a octahedron.

docs/lib3x-polyhedra_star.md

@@ -0,0 +1,24 @@
+# star
+
+Create a star. Default to a pentagram.
+
+**Since:** 3.2
+
+## Parameters
+
+- `outer_radius`: The outer radius of the star. Default to 1.
+- `inner_radius`: The inner radius of the star. Default to 0.381966.
+- `height`: The star height. Default to 0.5.
+- `n`: The burst number. Default to 5.
+
+## Examples
+
+	use <polyhedra/star.scad>;
+
+	for(i = [3:6]) {
+		translate([(i - 3) * 2, 0])
+			star(n = i);
+	}
+
+![star](images/lib3x-polyhedra_star-1.JPG)
+

src/polyhedra/star.scad

@@ -1,3 +1,13 @@
+/**
+* star.scad
+*
+* @copyright Justin Lin, 2021
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib3x-polyhedra_star.html
+*
+**/
+
 use <geom_star.scad>;
 
 module star(outerRadius = 1, innerRadius =  0.381966, height = 0.5, n = 5) {