Added some cookbook for django and serializer

docs/cookbook.rst

@@ -26,3 +26,66 @@ If you need a more fine graned authentication you could check your current endpo
                 return self.request.user.is_authenticated()
             else:
                 return True
+
+
+Example with Django
+===================
+
+This is an example of an endpoint for a model Book::
+
+    from restless.dj import DjangoResource
+    from restless.preparers import FieldsPreparer
+
+    from .models import Book
+
+    class BookResource(DjangoResource):
+        preparer = FieldsPreparer(fields={
+            'book_author': 'author.name',
+            'book_title': 'title',
+            'book_pages': 'pages',
+        })
+
+        def list(self):
+          return Book.objects.all()
+
+        def detail(self, pk):
+           return Book.objects.get(id=pk)
+
+        def create(self):
+            return Book.objects.create(
+                author=Author.objects.get(name=self.data['author']),
+                title=self.data['title'],
+                pages=self.data['pages']
+            )
+
+        def update(self, pk):
+            book = Book.objects.get(id=pk)
+            book.author = Author.objects.get(name=self.data['author'])
+            book.title = self.data['title']
+            book.pages = self.data['pages']
+            book.save
+            return book
+
+
+    # On the urls.py...
+    from django.conf.urls import include, path
+    from .api import BookResource
+
+    urlpatterns = [
+        path(r'books/', include(BookResource.urls())),
+    ]
+
+
+Using serializer
+================
+
+How to use restless without preparers. The methods must return a dict:: 
+
+    from restless.resources import Resource
+    from restless.serializers import JSONSerializer
+
+    class MyResource(Resource):
+        serializer = JSONSerializer()
+
+        def detail(self, pk):
+            return {'pk': pk}