[Serving] Add a simple Python serving (#962)

* init simple serving

* simple serving is working

* ppyoloe demo

* Update README_CN.md

* update readme

* complete vision result to json

python/fastdeploy/serving/server.py

@@ -0,0 +1,46 @@
+# coding:utf-8
+# Copyright (c) 2022  PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from fastapi import FastAPI
+from .router import HttpRouterManager
+from .model_manager import ModelManager
+
+
+class SimpleServer(FastAPI):
+    def __init__(self, **kwargs):
+        """
+        Initial function for the FastDeploy SimpleServer.
+        """
+        super().__init__(**kwargs)
+        self._router_manager = HttpRouterManager(self)
+        self._model_manager = None
+        self._service_name = "FastDeploy SimpleServer"
+        self._service_type = None
+
+    def register(self, task_name, model_handler, predictor):
+        """
+        The register function for the SimpleServer, the main register argrument as follows:
+
+        Args:
+            task_name(str): API URL path.
+            model_handler: To process request data, run predictor,
+                and can also add your custom post processing on top of the predictor result
+            predictor: To run model predict
+        """
+        self._server_type = "models"
+        model_manager = ModelManager(model_handler, predictor)
+        self._model_manager = model_manager
+        # Register model server router
+        self._router_manager.register_models_router(task_name)