Introduced narrative overview of available download views in document…

…ation.

README

@@ -19,6 +19,15 @@ Example, in some urls.py:
    url_patterns = ('',
        url('^download/(?P<slug>[A-Za-z0-9_-]+)/$', download, name='download'),
    )
+
+Several views are provided to cover frequent use cases:
+
+* ``PathDownloadView`` when you have an absolute filename.
+* ``ObjectDownloadView`` when you have a model with a file field.
+
+See :doc:`views` for details.
+
+Then get increased performances with :doc:`optimizations/index`.
 
 
 **********

docs/index.txt

@@ -10,6 +10,7 @@ Contents
 
    demo
    install
+   views
    optimizations/index
    api/index
    about/index

docs/views.txt

@@ -0,0 +1,37 @@
+##############
+Download views
+##############
+
+This section contains narrative overview about class-based views provided by
+django-downloadview.
+
+
+****************
+PathDownloadView
+****************
+
+The :py:class:`django_downloadview.views.PathDownloadView` class-based view
+allows you to **serve files given an absolute path on local filesystem**.
+
+Two main use cases:
+
+* as a shortcut. This dead-simple view is straight to call, so you can use it
+  to simplify code in more complex views, provided you have an absolute path to
+  a local file.
+
+* override. Extend :py:class:`django_downloadview.views.PathDownloadView` and
+  override :py:meth:`django_downloadview.views.PathDownloadView:get_path`.
+
+
+******************
+ObjectDownloadView
+******************
+
+The :py:class:`django_downloadview.views.ObjectDownloadView` class-based view
+allows you to **serve files given a model with some file fields** such as
+FileField or ImageField.
+
+Use this view anywhere you could use Django's builtin ObjectDetailView.
+
+Some options allow you to store file metadata (size, content-type, ...) in the
+model, as deserialized fields.