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Add citation and mirror docs

Add OPPO preprocessed files under datasets/oppo

Add PAMAP2 preprocessed files under datasets/pamap2

Add WISDM preprocessed files under datasets/wisdm

Add WSBHA preprocessed files under datasets/WSBHA

Add UniMiB preprocessed files under datasets/unimib

Add UCI preprocessed files under datasets/uci

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Update README.md

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