Add link to English Translator note

Add the link to Chinese version of README.md
https://github.com/TommyZihao/face_recognition/blob/master/README_Simplified_Chinese.md

I translate the comment in "web_service_example.py" into Chinese for Chinese developers to learn.

Translate the comment in "web_service_example.py" into Chinese.

Translator's note:
Face_recognition is a powerful, simple and easy-to-use face recognition open source project with complete development documents and application cases, especially it is compatible with Raspberry Pi.
In order to facilitate Chinese software developers to learn, make progress in face recognition development and source code contributions, I translated README file into simplified Chinese.
Salute to all contributors to this project.
Translator: Tommy in Tongji Univerisity Opensource Association  [子豪兄Tommy](https://github.com/TommyZihao)