Add a stub for bundlebuilder documentation.

Doc/library/bundlebuilder.rst

@@ -0,0 +1,28 @@
+:mod:`bundlebuilder` --- Assemble MacOS X (application) bundles
+===============================================================
+
+.. module:: bundlebuilder
+   :synopsis: Tools to assemble MacOS X (application) bundles.
+   :platform: Mac
+.. moduleauthor:: Just van Rossum
+
+.. index::
+   pair: creating; application bundles
+
+This module contains two classes to build so called "bundles" for MacOS X.
+:class:`BundleBuilder` is a general tool, :class:`AppBuilder` is a subclass
+specialized in building application bundles.
+
+These Builder objects are instantiated with a bunch of keyword arguments, and
+have a :meth:`build` method that will do all the work.
+
+The module also contains a main program that can be used in two ways::
+
+   % python bundlebuilder.py [options] build
+   % python buildapp.py [options] build
+
+where :file:`buildapp.py` is a user-supplied setup.py-like script following this
+model::
+
+   from bundlebuilder import buildapp
+   buildapp(<lots-of-keyword-args>)

Doc/library/mac.rst

@@ -21,3 +21,4 @@ Mac-specific Python programming.
    autogil.rst
    carbon.rst
    colorpicker.rst
+   bundlebuilder.rst