* add data introduction for example supplychain
* add schema modeling for example supplychain
* add kg construction for example supplychain
* add kg query for example supplychain
* finish README_cn.md for the supplychain example
* finish README.md for the supplychain example
* add README.md for the riskmining example
* add README.md for the medicine example
* update README.md of hotpotqa, 2wiki and musique
* add README_cn.md for hotpotqa, 2wiki and musique
* update README.md of csqa
* add README_cn.md for csqa
* update link targets to 0.6 version of the docs
* add README.md for baike
* reformat Python code in examples
