add doc

README.md

@@ -241,7 +241,7 @@ See [examples](examples#dogfooding-examples).
 - [voronoi/vrn2_cells_from](https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn2_cells_from.html)
 - [voronoi/vrn2_cells_space](https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn2_cells_space.html)
 - [voronoi/vrn3_from](https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn3_from.html)
-- voronoi/vrn3_space
+- [voronoi/vrn3_space](https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn3_space.html)
 
 ----
 

docs/lib2x-vrn3_space.md

@@ -0,0 +1,23 @@
+# vrn3_space
+
+Creats a [Voronoi diagram](https://en.wikipedia.org/wiki/Voronoi_diagram) in the first octant. You specify a space and a grid width. The center of each cell will be distributed in each grid randomly.
+
+**Since:** 2.4
+
+## Parameters
+
+- `size` : 3 value array [x, y, z].
+- `grid_w` : The width of each grid. 
+- `seed` : Seed value for random number generator for repeatable results.
+- `spacing` : Distance between cells. Default to 1.
+
+## Examples
+
+    use <voronoi/vrn3_space.scad>;
+
+    vrn3_space(
+        size = [20, 15, 10],
+        grid_w = 5
+    );
+
+![vrn3_space](images/lib2x-vrn3_space-1.JPG)

src/voronoi/vrn3_space.scad

@@ -1,3 +1,13 @@
+/**
+* vrn3_space.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn3_space.html
+*
+**/
+
 use <__comm__/__angy_angz.scad>;
 
 // slow but workable