upload an introduction about chemical formula and update readme.md

opendatalab / MinerU

A one-stop, open-source, high-quality data extraction tool, supports PDF/webpage/e-book extraction.一站式开源高质量数据提取工具，支持PDF/网页/多格式电子书提取。

https://opendatalab.com/OpenSourceTools

GNU Affero General Public License v3.0

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Closed GDDGCZ518 closed 2 weeks ago

GDDGCZ518 commented 2 weeks ago

upload an introduction about chemical formula and update readme.md