Update README.md

README.md

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 This is python code of generating MP2, MP3, and MP4 correlation energy density based on **one boby decomposition scheme** (https://doi.org/10.1002/qua.22017)
 
-Requirement of python packages:
+Requirement of python packages: \
+```python
 numpy, scipy, h5py, torch, quadpy, itertools, mmap, tqdm
-Optional of python packages: 
-pycuda, skcuda (if you use GPU for preparing Ajb)
+```
+Optional of python packages: \
+```python
+pycuda, skcuda #if you use GPU for preparing Ajb
+```
+