Created by: jiweibo

Add 2.0 inference api demo

C++ doc: http://gzhxy-inf-bce36a39de.gzhxy.baidu.com:8121/documentation/docs/zh/advanced_guide/inference_deployment/inference/native_infer.html

python doc: http://gzhxy-inf-bce36a39de.gzhxy.baidu.com:8121/documentation/docs/zh/advanced_guide/inference_deployment/inference/python_infer_cn.html#python-api