added example using text meshing

examples/text.py

@@ -0,0 +1,25 @@
+from madcad import *
+
+r = 1
+h = 0.7
+e = 0.1
+
+# generate the shape to write on
+shape = cylinder(vec3(0,0,-h), vec3(0,0,h), r)
+
+# generate flat text as a Web (wireframe mesh)
+label = text.text("foo bar", fill=False)
+# wrap the mesh points around the cylinder
+label.points = typedlist(vec3(cos(p.x/r), sin(p.x/r), p.y-0.5)*r  
+                      for p in label.points)
+# extrude the mesh and give it a cylindric filling
+label = intersection(
+		extrusion(
+			scale(vec3(1-e-0.1*r, 1-e-0.1*r, 1)), 
+			label.transform(scale(vec3(1+e*1.1, 1+e*1.1, 1))),
+			), 
+		inflate(shape, e),
+		)
+# merge it onto the cylinder
+result = union(shape, label).finish()
+print(repr(result))