New generator: WSDL (#9545)

* init port

* add outputDir

* fill out current .md

* update samples

Co-authored-by: William Cheng <wing328hk@gmail.com>

samples/server/petstore/python-aiohttp-srclayout/tests/conftest.py

@@ -12,7 +12,7 @@ def client(loop, aiohttp_client):
         "swagger_ui": True
         }
     specification_dir = os.path.join(os.path.dirname(__file__), '..',
-                                     "src/",
+                                     "src\",
                                      'openapi_server',
                                      'openapi')
     app = connexion.AioHttpApp(__name__, specification_dir=specification_dir,