Update README.md

README.md

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 ## Dataset Format:
 We provide a few dataset files, including
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+- a human-teleoperated 2 demonstrations in HDF5 dataset file (`arena_gr1_manipulation_dataset_recorded.hdf5`)
 - a human-annoated 10 demonstrations in HDF5 dataset file (`arena_gr1_manipulation_dataset_annotated.hdf5`)
 - a Mimic-generated 50 demonstrations in HDF5 dataset file (`arena_gr1_manipulation_dataset_generated.hdf5`)
 - a GR00T-Lerobot formatted dataset converted from the Mimic-generated HDF5 dataset file (`lerobot`)
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 Each demo in GR00T-Lerobot datasets consists of a time-indexed sequence of the following modalities:
 
 ### Actions