Update README.md.

README.md

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+---
+license: gpl-3.0
+pretty_name: QMB Models
+size_categories:
+- 100M<n<1B
+---
+
 # QMB Models
 
-This repository contains several physical/chemical models.
+This repository houses a collection of physical and chemical models.
+These models are used as data for the `qmb` package, which can be found [here][qmb-url].
+
+This repository contains data in OpenFermion format originally sourced from [here][naqs-url] and distributed under the MIT License.
+To load the data in OpenFermion format, users can use the following Python code:
+```python
+openfermion.MolecularData(filename="xxx.hdf5")
+```
+For additional details, please consult the [official OpenFermion documentation][openfermion-url].
+
+This repository also includes data in FCIDUMP format, which has been compressed using gzip to reduce file size.
+FCIDUMP files typically contain essential information such as orbital number, electron number, and Hamiltonian data.
+To facilitate ease of use for upstream applications, we have named the FCIDUMP files in a structured format: `{model}_{n_electrons}_{n_qubits}.FCIDUMP.gz`.
+Additionally, we provide a reference energy catalog for these files in the file `FCIDUMP.json`.
+
+[qmb-url]: https://github.com/USTC-KnowledgeComputingLab/qmb
+[naqs-url]: https://github.com/tomdbar/naqs-for-quantum-chemistry
+[openfermion-url]: https://quantumai.google/openfermion