First draft of querysets document

docs/QUERYSETS.md

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+# QuerySets
+
+There are times when a carefully crafted query is right and there are times 
+when a simple CRUD interface can do the trick. Brubeck provides querysets that
+implement a simple CRUD interface. This is useful for the AutoAPI, support for
+basic caching and a consistent way of handling database connections.
+
+A `Queryset` is then an implementation of CRUD functions for a single item or
+multiple items. This type of interface makes the system consistent with the
+idea that data should be stored in a simple manner, eg. a key that maps to a
+particular document.
+
+If you need anything more complicated than that, it's easy enough to go from
+the DictShield model into something that will fit nicely with your custom
+query.
+
+Querysets are an area of active development but are still young in
+implementation.