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[skip ci]Add README.md in datanode (#9311)

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Signed-off-by: Yang Xuan <xuan.yang@zilliz.com>
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# Data Node
DataNode is the component to write insert and delete messages into persistent blob storage, for example minIO or S3.
## Dependency
- KV store: a kv store that persists messages into blob storage.
- Message stream: receive messages and publish imformation
- Root Coordinator: get the latest unique IDs.
- Data Coordinator: get the flush information and which message stream to subscribe.