Added Django-CMS integration instructions.

README.md

@@ -206,6 +206,58 @@ stacked inline is going to be very tall, I would suggest using
 TabularStackedInline instead.
 
 
+### Django-CMS integration
+Django-CMS plugins use their own change form, and thus won't automatically
+include the necessary JavaScript for django-admin-sortable to work. Fortunately,
+this is easy to resolve, as the `CMSPlugin` class allows a change form template to be
+specified:
+
+    # example plugin
+    from cms.plugin_base import CMSPluginBase
+
+    class CMSCarouselPlugin(CMSPluginBase):
+        admin_preview = False
+        change_form_template = 'cms/sortable-stacked-inline-change-form.html'
+        inlines = [SlideInline]
+        model = Carousel
+        name = _('Carousel')
+        render_template = 'carousels/carousel.html'
+
+        def render(self, context, instance, placeholder):
+            context.update({
+                'carousel': instance,
+                'placeholder': placeholder
+            })
+            return context
+
+    plugin_pool.register_plugin(CMSCarouselPlugin)
+
+The contents of `sortable-stacked-inline-change-form.html` at a minimum need to extend
+the extrahead block with:
+
+    {% extends "admin/cms/page/plugin_change_form.html" %}
+    {% load static from staticfiles %}
+
+    {% block extrahead %}
+        {{ block.super }}
+        <script type="text/javascript" src="{% static 'adminsortable/js/jquery-ui.django-admin.min.js' %}"></script>
+        <script type="text/javascript" src="{% static 'adminsortable/js/jquery.django-csrf.js' %}"></script>
+        <script type="text/javascript" src="{% static 'adminsortable/js/admin.sortable.stacked.inlines.js' %}"></script>
+
+        <link rel="stylesheet" type="text/css" href="{% static 'adminsortable/css/admin.sortable.inline.css' %}" />
+    {% endblock extrahead %}
+
+Sorting within Django-CMS is really only feasible for inline models of a
+plugin as Django-CMS already includes sorting for plugin instances. For tabular inlines,
+just substitute:
+
+    <script type="text/javascript" src="{% static 'adminsortable/js/admin.sortable.stacked.inlines.js' %}"></script>
+
+with:
+
+    <script type="text/javascript" src="{% static 'adminsortable/js/admin.sortable.tabular.inlines.js' %}"></script>
+
+
 ### Known Issue(s)
 Because of the way inline models are added to their parent model in the
 change form, it is not currently possible to have sortable inline models