Update README.md

* Add a link to the Docker image tonyy999/qmpy-v1.2

Author: Tony-Y

OQMD/README.md

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 **Note that the official OQMD v1.2 dataset for CGNN is available at [this link](https://doi.org/10.5281/zenodo.7118055). If you want to skip the dataset construction below, please place all the contents of the archive (oqmd-v1_2-for-cgnn.7z) in this folder (cgnn/OQMD).**
 
+**The Docker image for the qmpy environment [`tonyy999/qmpy-v1.2`](https://hub.docker.com/repository/docker/tonyy999/qmpy-v1.2) is available to skip configuring the qmpy environment.**
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 # The Open Quantum Materials Database (OQMD)
 If you want to use the OQMD as a dataset for training CGNN models, you need a conda environment with the [qmpy](https://github.com/wolverton-research-group/qmpy) installed. [pymatgen](http://pymatgen.org) is also necessary for the use of the data format of the Materials Project. Because the OQMD uses MySQL 5.7, first install it.