Create README_CN.md

python/examples/fit_a_line/README_CN.md

+# 线性回归，RPC预测服务示例
+
+(简体中文|[English](./README.md))
+
+## 开启RPC服务端
+``` shell
+sh get_data.sh
+python test_server.py uci_housing_model/
+```
+
+## RPC预测
+``` shell
+python test_client.py uci_housing_client/serving_client_conf.prototxt
+```
+
+## 开启HTTP服务端
+Start a web service with default web service hosting modules
+``` shell
+python -m paddle_serving_server.web_serve --model uci_housing_model/ --thread 10 --name uci --port 9393 --name uci
+```
+
+## HTTP预测
+``` shell
+curl -H "Content-Type:application/json" -X POST -d '{"x": [0.0137, -0.1136, 0.2553, -0.0692, 0.0582, -0.0727, -0.1583, -0.0584, 0.6283, 0.4919, 0.1856, 0.0795, -0.0332], "fetch":["price"]}' http://127.0.0.1:9393/uci/prediction
+```