Update readme

README.rst

@@ -8,7 +8,6 @@ How to install
 
     $ pip install aiohttp_pydantic
 
-
 Example:
 --------
 
@@ -71,3 +70,77 @@ Example:
 
     $ curl -H "Content-Type: application/json" -X post http://127.0.0.1:8080/article --data '{"name": "toto", "nb_page": "3"}'
     {"name": "toto", "number_of_page": 3}
+
+API:
+----
+
+Inject Path Parameters
+~~~~~~~~~~~~~~~~~~~~~~
+
+To declare a path parameters, you must declare your argument as a `positional-only parameters`_:
+
+
+Example:
+
+.. code-block:: python3
+
+    class AccountView(PydanticView):
+        async def get(self, customer_id: str, account_id: str, /):
+            ...
+
+    app = web.Application()
+    app.router.add_get('/customers/{customer_id}/accounts/{account_id}', AccountView)
+
+Inject Query String Parameters
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To declare a query parameters, you must declare your argument as simple argument:
+
+
+.. code-block:: python3
+
+    class AccountView(PydanticView):
+        async def get(self, customer_id: str):
+            ...
+
+    app = web.Application()
+    app.router.add_get('/customers', AccountView)
+
+Inject Request Body
+~~~~~~~~~~~~~~~~~~~
+
+To declare a body parameters, you must declare your argument as a simple argument annotated with `pydantic Model`_.
+
+
+.. code-block:: python3
+
+    class Customer(BaseModel):
+        first_name: str
+        last_name: str
+
+    class CustomerView(PydanticView):
+        async def post(self, customer: Customer):
+            ...
+
+    app = web.Application()
+    app.router.add_view('/customers', CustomerView)
+
+Inject HTTP headers
+~~~~~~~~~~~~~~~~~~~
+
+To declare a HTTP headers parameters, you must declare your argument as a `keyword-only argument`_.
+
+
+.. code-block:: python3
+
+    class CustomerView(PydanticView):
+        async def get(self, *, authorization: str, expire_at: datetime):
+            ...
+
+    app = web.Application()
+    app.router.add_view('/customers', CustomerView)
+
+
+.. _positional-only parameters: https://www.python.org/dev/peps/pep-0570/
+.. _pydantic Model: https://pydantic-docs.helpmanual.io/usage/models/
+.. _keyword-only argument: https://www.python.org/dev/peps/pep-3102/