Renamed and simplified the logo model

examples/Basics/logo.scad

@@ -0,0 +1,30 @@
+// logo.scad - Basic example of difference() usage in OpenSCAD
+
+echo(version=version());
+
+size = 50;
+hole = 25;
+cylinderHeight = size * 1.25;
+$fn = 32; // Increasing this makes the logo smoother
+
+// One positive object (sphere) and three negative objects (cylinders)
+difference() {
+    sphere(d=size);
+
+    cylinder(d=hole, h=cylinderHeight, center=true);
+    // The '#' operator highlights the object
+    #rotate([90, 0, 0]) cylinder(d=hole, h=cylinderHeight, center=true);
+    rotate([0, 90, 0]) cylinder(d=hole, h=cylinderHeight, center=true);
+}
+
+// Written by Clifford Wolf <clifford@clifford.at> and Marius
+// Kintel <marius@kintel.net>
+//
+// To the extent possible under law, the author(s) have dedicated all
+// copyright and related and neighboring rights to this software to the
+// public domain worldwide. This software is distributed without any
+// warranty.
+//
+// You should have received a copy of the CC0 Public Domain
+// Dedication along with this software.
+// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.