added ellipse

docs/lib-ellipse.md

@@ -0,0 +1,24 @@
+# ellipse
+
+Creates an ellipse. 
+
+## Parameters
+
+- `axes` : 2 element vector `[x, y]` where x is the semi-major axis and y is the semi-minor axis.
+- `$fa`, `$fs`, `$fn` : The shape created by this module can be viewd as `resize([x, y]) circle(r = x)` (but not the real implementation inside the module) so you can use these global variables to control it. Check [the circle module](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#circle) for more details. 
+
+## Examples
+
+	include <ellipse.scad>;
+	
+	ellipse([40, 20]);
+
+![ellipse](images/lib-ellipse-1.JPG)
+
+	include <ellipse.scad>;
+	
+	$fn = 8;
+	ellipse([20, 40]);
+
+![ellipse](images/lib-ellipse-2.JPG)
+