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Add dataset card

uploaded 3 split of the DiverseVul dataset. Downloaded from the paper Github repository:https://github.com/wagner-group/diversevul?tab=readme-ov-file

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Delete diversevul_20230702.json with huggingface_hub

Uploaded diversevul_20230702.json

uploaded the 3 main part of the dataset: train,valid,test

initial commit