Add dataset description

README.md

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+# Datasets of GAOT
+
+This repository contains the datasets used in the paper  
+**"Geometry Aware Operator Transformer as an Efficient and Accurate Neural Surrogate for PDEs on Arbitrary Domains."**
+
+The repository includes two subfolders:
+
+- `time_dep/` — time-dependent datasets  
+- `time_indep/` — time-independent datasets  
+
+In addition, some datasets used in the paper are provided by [RIGNO](https://arxiv.org/pdf/2501.19205).  
+These can be downloaded from [Zenodo](https://zenodo.org/records/14765453).
+
+For a detailed description of all datasets, please refer to **Supplementary Material, Table D.1** of the paper.
+
+---
+
+### Data Structure
+
+Each file contains either two or three groups:
+
+- **u**: the vector-valued solution function  
+- **c**: the vector-valued known spatial parameters (constant in time)  
+- **x**: the spatial coordinates in all directions (e.g., *x* and *y*)  
+
+All arrays are 4-dimensional with the following axis order: `[batch, time, space, variables]`.