中文Mixtral大模型 v1.2

本次更新添加了仿OpenAI API Demo。教程：https://github.com/ymcui/Chinese-Mixtral/wiki/openai_api_zh

This release adds OpenAI API Demo. Tutorial: https://github.com/ymcui/Chinese-Mixtral/wiki/openai_api_en

What's Changed

• Add OpenAI API Demo by @ymcui in #25

Full Changelog: v1.1...v1.2