added rounded_cube

docs/lib-rounded_cube.md

@@ -0,0 +1,44 @@
+# rounded_cube
+
+Creates a cube in the first octant. When center is true, the cube is centered on the origin.
+
+## Parameters
+
+- `size` : Accepts a single value, cube with all sides this length. It also accepts 3 value array `[x, y, z]`, cube with dimensions `x`, `y` and `z`.
+- `corner_r` : The corner is one-eight of a sphere. The `corner_r` parameter determines the sphere radius.
+- `center` : `false` (default), 1st (positive) octant, one corner at (0,0,0). `true`, cube is centered at (0,0).
+- `$fa`, `$fs`, `$fn` : Used to control the four quadrants. Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) for more details. The final fragments of a sphere will be a multiple of 4 to fit edges.
+
+## Examples
+
+	include <rounded_cube.scad>;
+	
+	rounded_cube(20, 5);
+
+![rounded_cube](images/lib-rounded_cube-1.JPG)
+
+	include <rounded_cube.scad>;
+	
+	rounded_cube(
+	    size = [50, 25, 15], 
+	    corner_r = 5,
+	    center = true
+	);
+
+![rounded_cube](images/lib-rounded_cube-2.JPG)
+
+	include <rounded_cube.scad>;
+	
+	$fn = 8;
+	
+	rounded_cube(
+	    size = [50, 25, 15], 
+	    corner_r = 5,
+	    center = true
+	);
+
+![rounded_cube](images/lib-rounded_cube-3.JPG)
+
+
+
+