Update README.md

README.md

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-license: cc-by-nc-4.0
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+---
+license: cc-by-nc-4.0
+---
+
+# Short Description
+
+Based on the incompressible Navier-Stokes equations, this dataset contains trajectories starting from initial conditions with Gaussians in the vorticity.
+It also contains a passive tracer that is carried by the flow.
+
+# Dimensions
+
+The assembled NetCDF file has a **single** variable called *velocity* with dimensionality
+  - 20000 (number of trajectories)
+  - 21 (time steps)
+  - 3 (horizontal velocity, vertical velocity, passive tracer)
+  - 128 (x-dim)
+  - 128 (y-dim)
+
+It was simulated on the unit square up to T=1 and saved as uniformly spaced in space and time.
+
+# Train/Val/Test-split
+
+19640/120/240 trajectories
+
+# Download & Assembly
+
+The dataset can be downloaded, e.g., via `huggingface-cli download`.
+
+After download, the chunked data can be assembled into a single NetCDF file using the provided `assemble_data.py` script.
+Use it as follows:
+```bash
+python assemble_data.py --input_dir . --output_file NS-Gauss.nc
+```