Docs: Add a glossary

Commonly used terms should be explained there.

docs/source/index.rst

@@ -78,6 +78,7 @@ First steps
    internals/getting_started
    topics/key_questions
    internals/getting_help
+   ref/glossary
 
 Using Oscar
 ===========

docs/source/ref/glossary.rst

@@ -0,0 +1,32 @@
+========
+Glossary
+========
+
+This is a work-in-progress list of commonly used terms when discussing Oscar.
+
+.. glossary::
+    :sorted:
+
+    Partner
+    Fulfillment partner
+       An individual or company who can fulfil products. E.g. for physical
+       goods, somebody with a warehouse and means of delivery.
+
+       .. seealso:: Related model: :class:`oscar.apps.partner.abstract_models.AbstractPartner`
+
+    SKU
+    Stock-keeping unit.
+       A :term:`partner`'s way of tracking her products. Uniquely identifies a
+       product in the partner's warehouse. Can be identical to the products
+       :term:`UPC`. It's stored as an attribute of
+       :attr:`StockRecord <oscar.apps.partner.abstract_models.AbstractStockRecord.partner_sku>`
+
+       .. seealso:: `Wikipedia <http://http://en.wikipedia.org/wiki/Stock-keeping_unit>`_
+
+    UPC
+    Universal Product Code
+       A code uniquely identifying a product worldwide.
+
+       .. seealso:: `Wikipedia <http://en.wikipedia.org/wiki/Universal_Product_Code>`
+
+