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, this dataset contains the steady-state density over airfoils.
+
+# Dimensions
+
+The assembled NetCDF file has a **single** variable called *solution* with dimensionality
+  - 10869 (number of trajectories)
+  - 2 (airfoil shape, density)
+  - 128 (x-dim)
+  - 128 (y-dim)
+
+# Train/Val/Test-split
+
+10509/120/240 trajectories
+
+# Download & Assembly
+
+The dataset can be downloaded, e.g., via `huggingface-cli download`.