Add Transition1x-test readme file

README.md

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+---
+configs:
+- config_name: default
+  data_files: "main/*.parquet"
+license: mit
+tags:
+- molecular dynamics
+- mlip
+- interatomic potential
+pretty_name: Transition1x-test
+---
+# Dataset  
+Transition1x-test  
+### Description  
+The test split of the Transition1x dataset. Transition1x is a benchmark dataset containing 9.6 million Density Functional Theory (DFT) calculations of forces and energies of molecular configurations on and around reaction pathways at the ωB97x/6-31 G(d) level of theory. The configurations contained in this dataset allow a better representation of features in transition state regions when compared to other benchmark datasets -- in particular QM9 and ANI1x.  
+<br>Additional details stored in dataset columns prepended with "dataset_".  
+### Dataset authors  
+Mathias Schreiner, Arghya Bhowmik, Tejs Vegge, Jonas Busk, Ole Winther  
+### Publication  
+https://doi.org/10.1038/s41597-022-01870-w  
+### Original data link 
+https://doi.org/10.6084/m9.figshare.19614657.v4  
+### License  
+MIT  
+### Number of unique molecular configurations  
+190277  
+### Number of atoms  
+2106770  
+### Elements included  
+C, H, N, O  
+### Properties included  
+energy, atomic forces, cauchy stress  
+### Cite this dataset
+Schreiner, M., Bhowmik, A., Vegge, T., Busk, J., and Winther, O. _Transition1x-test_. ColabFit, 2023. https://doi.org/10.60732/f26a9f60