Update README.md

文章最后新增 links 友谊链接，给opendatalab 其他项目同步引流、宣传lableU、labelllm、mineru

README.md

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+## Links
+- [LabelU (A Lightweight Multi-modal Data Annotation Tool)](https://github.com/opendatalab/labelU)
+- [LabelLLM (An Open-source LLM Dialogue Annotation Platform)](https://github.com/opendatalab/LabelLLM)
+- [Miner U (A One-stop Open-source High-quality Data Extraction Tool)](https://github.com/opendatalab/MinerU)