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 compressible Euler equations with gravitation, this dataset contains trajectories of the Rayleigh-Taylor problem.
+It also contains a passive tracer that is carried by the flow.
+
+# Dimensions
+
+The assembled NetCDF file has a **single** variable called *solution* with dimensionality
+ - 1260 (number of trajectories)
+ - 11 (time steps)
+ - 6 (density, horizontal velocity, vertical velocity, pressure, passive tracer, gravitational potential)
+ - 128 (x-dim)
+ - 128 (y-dim)
+
+It was simulated on the unit square up to T=5 and saved as uniformly spaced in space and time.
+
+# Train/Val/Test-split
+
+1030/100/130 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 GCE-RT.nc
+```