Add NMD-18 readme file

README.md

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+---
+configs:
+- config_name: default
+  data_files: "main/*.parquet"
+license: cc0-1.0
+tags:
+- molecular dynamics
+- mlip
+- interatomic potential
+pretty_name: NMD-18
+---
+# Dataset  
+NMD-18  
+### Description  
+3,000 Al-Ga-In sesquioxides with energies and band gaps. Relaxed and Vegard's Law geometries with formation energy and band gaps at DFT-PBE level of theory of (Alx-Gay-Inz)2O3 oxides, x+y+z=1. Contains all structures from the NOMAD 2018 Kaggle challenge training and leaderboard data. The formation energy and bandgap energy were computed by using the PBE exchange-correlation DFT functional with the all-electron electronic structure code FHI-aims with tight setting.  
+<br>Additional details stored in dataset columns prepended with "dataset_".  
+### Dataset authors  
+Christopher Sutton, Luca M. Ghiringhelli, Takenori Yamamoto, Yury Lysogorskiy, Lars Blumenthal, Thomas Hammerschmidt, Jacek R. Golebiowski, Xiangyue Liu, Angelo Ziletti, Matthias Scheffler  
+### Publication  
+https://doi.org/10.1038/s41524-019-0239-3  
+### Original data link 
+https://qmml.org/datasets.html  
+### License  
+CC0-1.0  
+### Number of unique molecular configurations  
+3000  
+### Number of atoms  
+185070  
+### Elements included  
+Al, Ga, In, O  
+### Properties included  
+formation energy, atomic forces, electronic band gap, cauchy stress