Add dataset card and metadata for Garment Particles

Add garment_particle_v2_test_11182025.txt train/test split

Add garment_particle_v2_train_11182025.txt train/test split

Add particle shard 0025

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Add particle shard 0019

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Add particle shard 0009

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Add particle shard 0002

Add particle shard 0001

Add particle shard 0000

initial commit