create-an-ai-tweet-generator-openai-langchain

[luojiyin1987]

Checklist:

• [x] I have read freeCodeCamp's contribution guidelines.
• [x] My pull request has a descriptive title (not a vague title like Update index.md)

Closes #1178

[luojiyin1987]

@miyaliu666 翻译完成

[miyaliu666]

译文很流畅，谢谢 @luojiyin1987 ，抱歉我 review 比较慢。