Update README.md

README.md

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 BAAI DataCube Datasets is an open collection of high-quality datasets.
-Rather than being the DataCube system itself, this organization hosts diverse open datasets built on top of DataCube, covering research directions, including but not limited to:
+Rather than being the [**Datacube**](https://datacube.baai.ac.cn/) system itself, this organization hosts diverse open datasets built on top of DataCube, covering research directions, including but not limited to:
 
 - 🎬 Multimodal video datasets