Update README.md

README.md

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 ## 📌 Dataset Summary
 
+![ASTime Dataset Statistical Overview](./dataset_statistics.png)
+*Statistical overview of the ASTime dataset. (A) The dataset scale and train/val/test split summarize the videos, participants, recorded time, annotated events, atomic actions, and activity labels. (B) The atomic action distribution presents the frequency of fine-grained activity categories. (C) The human-state coverage groups state-specific action occurrences into four semantic domains.*
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 The statistics below are computed from the files in this repository under `Videos/` and `Annotations/`.
 
 | Split | Subjects | Videos | Transition events | Duration | Frames |