Create v1, scad, objects hierarchy

v1/scad/lib/torus.scad

@@ -0,0 +1,6 @@
+module torus(r_major, r_minor, xs=1.0, ys=1.0) {
+    rotate_extrude()
+    translate([r_major, 0, 0])
+    scale([xs, ys, 1.0])
+    circle(r=r_minor);
+}