Improve readme

README.md

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 # Oscar Odin
 
+Mapping of Oscar eCommerce models to Odin resources.
+
+## Installation
+
 To install add `oscar_odin` to your installed apps
+
+## Usage
+
+```python
+from oscar.core.loading import get_model
+from oscar_odin.mappings import catalogue
+
+Product = get_model("catalogue", "Product")
+
+# Map a product to a resource.
+product = Product.objects.get(id=1)
+product_resource = catalogue.product_to_resource(product)
+```