Add Codacy badge

Author: codacy-badger

README.md

@@ -1,5 +1,6 @@
 # Alibaba Cloud Python Software Development Kit
 
+[![Codacy Badge](https://api.codacy.com/project/badge/Grade/6c81a06478ab41f7b1e803c0d4443c73)](https://app.codacy.com/app/aliyun/aliyun-openapi-python-sdk?utm_source=github.com&utm_medium=referral&utm_content=aliyun/aliyun-openapi-python-sdk&utm_campaign=Badge_Grade_Dashboard)
 [![Build Status](https://travis-ci.org/aliyun/aliyun-openapi-python-sdk.svg?branch=master)](https://travis-ci.org/aliyun/aliyun-openapi-python-sdk)
 [![Build status](https://ci.appveyor.com/api/projects/status/ddq0kwqqbep9jasi/branch/master?svg=true)](https://ci.appveyor.com/project/aliyun/aliyun-openapi-python-sdk/branch/master)
 [![codecov](https://codecov.io/gh/aliyun/aliyun-openapi-python-sdk/branch/master/graph/badge.svg)](https://codecov.io/gh/aliyun/aliyun-openapi-python-sdk)