Documented the API and added some help for the config file

docs/api.rst

@@ -0,0 +1,23 @@
+.. _api:
+
+The REST API
+############
+
+Paperless makes use of the `Django REST Framework`_ standard API interface
+because of its inherent awesomeness.  Conveniently, the system is also
+self-documenting, so learn more about the access points, schema, what's
+accepted and what isn't, you need only visit ``/api`` on your local Paperless
+installation.
+
+.. _Django REST Framework: http://django-rest-framework.org/
+
+
+.. _api-uploading:
+
+Uploading
+---------
+
+File uploads in an API are hard and so far as I've been able to tell, there's
+no standard way of accepting them, so rather than crowbar file uploads into the
+REST API and endure that headache, I've left that process to a simple HTTP
+POST, documented on the :ref:`consumption page <consumption-http>`.