Update README.md

PhysToolBench: Benchmarking Physical Tool Understanding for MLLMs
[github repo](https://github.com/EnVision-Research/PhysToolBench)

README.md

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----
-dataset_info:
-  features:
-  - name: id
-    dtype: string
-  - name: difficulty
-    dtype: string
-  - name: task_id
-    dtype: string
-  - name: image
-    dtype: image
-  - name: correct_tool
-    dtype: string
-  - name: cot_prompt
-    dtype: string
-  - name: no_cot_prompt
-    dtype: string
-  splits:
-  - name: train
-    num_bytes: 1670050311
-    num_examples: 1012
-  download_size: 1670796005
-  dataset_size: 1670050311
-configs:
-- config_name: default
-  data_files:
-  - split: train
-    path: data/train-*
----