Add deep learning applications in heavy ion physics

[lgpang]

I'd like to add my paper to the list, thanks a lot!

[matthewfeickert]

@lgpang looks good. Can you please:

• Link to the corresponding INSPIRE page instead of arXiv
• Adopt the same date formatting as shown in the rest of the papers section
• Add the bibtex reference (as it appears on INSPIRE) to the HEPML.bib ?

[matthewfeickert]

@lgpang Looks great. Many thanks for your paper and your contribution to the repo!