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 Poisson equation, this dataset contains the solution when given a source term that is a sum of Gaussians.
+
+# Dimensions
+
+The NetCDF file has **two** variables called *solution* with dimensionality
+  - 20000 (number of samples)
+  - 128 (x-dim)
+  - 128 (y-dim)
+and *source* with dimensionality:
+  - 20000 (number of samples)
+  - 128 (x-dim)
+  - 128 (y-dim)
+
+# Train/Val/Test-split
+
+19640/120/240 trajectories
+
+# Download
+
+The dataset can be downloaded, e.g., via `huggingface-cli download`.