Update doc

docs/reference.rst

@@ -10,7 +10,20 @@
 .. highlight:: python
 
 
-Public functions
-================
+Public API functions
+====================
+
+.. coroutine:: remember(request, response, identity, **kwargs)
+
+   Remember identity
+
+
+.. function:: setup(app, identity_policy, autz_policy)
+
+   Setup :mod:`aiohttp` application with security policies.
+
+
+Abstract policies
+=================