Update dataset structure

README.md

@@ -49,7 +49,8 @@ GIT_LFS_SKIP_SMUDGE=1 git clone https://huggingface.co/datasets/InternRobotics/I
 vln_pe
 ├── raw_data/                       # JSON files defining tasks, navigation goals, and dataset splits
 │   └── r2r/
-│       ├── train/
+│       ├── mini/
+│       │   └── mini.json.gz        # For quick Model and Environments validation
 │       ├── train/
 │       ├── val_seen/
 │       │   └── val_seen.json.gz