add general-client README_CN.md for brpc client

core/general-client/README_CN.md

+# 用于Paddle Serving的C++客户端
+
+(简体中文|[English](./README.md))
+
+## 请求BRPC-Server
+
+### 服务端启动
+
+以fit_a_line模型为例，服务端启动与常规BRPC-Server端启动命令一样。
+
+```
+cd ../../python/examples/fit_a_line
+sh get_data.sh
+python -m paddle_serving_server.serve --model uci_housing_model --thread 10 --port 9393
+```
+
+### 客户端预测
+
+客户端目前支持BRPC
+目前已经实现了BRPC的封装函数，详见[brpc_client.cpp](./src/brpc_client.cpp)
+
+```
+./simple_client --client_conf="uci_housing_client/serving_client_conf.prototxt" --server_port="127.0.0.1:9393" --test_type="brpc" --sample_type="fit_a_line"
+```
+
+更多示例详见[simple_client.cpp](./example/simple_client.cpp)
+
+<center>
+| Argument                                       | Type | Default                              | Description                                           |
+| ---------------------------------------------- | ---- | ------------------------------------ | ----------------------------------------------------- |
+| `client_conf`                                  | str  | `"serving_client_conf.prototxt"`     | Path of client conf                                   |
+| `server_port`                                  | str  | `"127.0.0.1:9393"`                   | Exposed ip:port of server                             |
+| `test_type`                                    | str  | `"brpc"`                             | Mode of request "brpc"                        |
+| `sample_type`                                  | str  | `"fit_a_line"`                       | Type of sample include "fit_a_line,bert"              |