Exclude flake8 syntax in docs. Added tea_store example

docs/playground/examples/tea_store.graphql

@@ -0,0 +1,8 @@
+query {
+  store {
+    teas(orderBy:"name") {
+      name
+      steepingTime
+    }
+  }
+}

docs/playground/examples/tea_store.schema.py

@@ -0,0 +1,38 @@
+import graphene
+
+class Tea(graphene.ObjectType):
+    name = graphene.String()
+    steeping_time = graphene.Int()
+
+TEAS = [
+    Tea(name='Earl Grey Blue Star', steeping_time=5),
+    Tea(name='Milk Oolong', steeping_time=3),
+    Tea(name='Gunpowder Golden Temple', steeping_time=3),
+    Tea(name='Assam Hatimara', steeping_time=5),
+    Tea(name='Bancha', steeping_time=2),
+    Tea(name='Ceylon New Vithanakande', steeping_time=5),
+    Tea(name='Golden Tip Yunnan', steeping_time=5),
+    Tea(name='Jasmine Phoenix Pearls', steeping_time=3),
+    Tea(name='Kenya Milima', steeping_time=5),
+    Tea(name='Pu Erh First Grade', steeping_time=4),
+    Tea(name='Sencha Makoto', steeping_time=3),
+]
+
+class Store(graphene.ObjectType):
+    teas = graphene.List(Tea, order_by=graphene.String())
+
+    def resolve_teas(self, args, info):
+        order_by = args.get("order_by")
+        if order_by == "steepingTime":
+            return sorted(self.teas, key=lambda tea: tea.steeping_time)
+        elif order_by == "name":
+            return sorted(self.teas, key=lambda tea: tea.name)
+        return self.teas
+
+class Query(graphene.ObjectType):
+    store = graphene.Field(Store)
+
+    def resolve_store(self, args, info):
+        return Store(teas=TEAS) 
+
+schema = graphene.Schema(query=Query)

setup.cfg

@@ -1,5 +1,5 @@
 [flake8]
-exclude = setup.py
+exclude = setup.py,docs/*
 max-line-length = 120
 
 [coverage:run]