Add NNIP_FeH_PRM_2021 readme file

README.md

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+---
+configs:
+- config_name: default
+  data_files: "main/*.parquet"
+license: cc-by-4.0
+tags:
+- molecular dynamics
+- mlip
+- interatomic potential
+pretty_name: NNIP FeH PRM 2021
+---
+### Cite this dataset  
+Meng, F., Du, J., Shinzato, S., Mori, H., Yu, P., Matsubara, K., Ishikawa, N., and Ogata, S. _NNIP FeH PRM 2021_. ColabFit, 2023. https://doi.org/10.60732/6e08b70b
+  ### View on the ColabFit Exchange  
+https://materials.colabfit.org/id/DS_nb8hcpibz1dt_0  
+# Dataset  Name  
+NNIP FeH PRM 2021  
+### Description  
+Approximately 20,000 configurations from a dataset of alpha-iron and hydrogen. Properties include forces and potential energy, calculated using VASP at the DFT level using the GGA-PBE functional.  
+<br>Additional details stored in dataset columns prepended with "dataset_".  
+### Dataset authors  
+Fan-Shun Meng, Jun-Ping Du, Shuhei Shinzato, Hideki Mori, Peijun Yu, Kazuki Matsubara, Nobuyuki Ishikawa, Shigenobu Ogata  
+### Publication  
+https://doi.org/10.1103/PhysRevMaterials.5.113606  
+### Original data link 
+https://github.com/mengfsou/NNIP-FeH  
+### License  
+CC-BY-4.0  
+### Number of unique molecular configurations  
+20920  
+### Number of atoms  
+1870008  
+### Elements included  
+Fe, H  
+### Properties included  
+energy, atomic forces, cauchy stress