Add skins chapter.

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+.. _skins_chapter:
+
+=====
+Skins
+=====
+
+In CMF, a "skin layer" is defined as a collection of templates and
+code (Python scripts, DTML methods, etc) that can be activated and
+deactivated within a particular setup.  A collection of active "skin
+layers" grouped in a particular order forms a "skin".  "Add-on" CMF
+products often provide skin layers that are activated within a
+particular skin to provide the site with additional features.
+
+:mod:`repoze.bfg` itself has no such concept, and no package provides
+a direct replacement, but bfg :term:`view` code combined with
+differing :term:`request type` attributes can provide a good deal of
+the same sort of behavior.  The `vudo.bfg <http://docs.vudo.me/>`_
+package is an attempt to allow directories on disk to represent
+collections of templates, each of which can be thought of as a minimal
+skin.
+
+