Add a paper about efficient multimodal models

[sdc17]

Hi, @pliang279, very thanks for your great list from which I learned a lot!

Recently, we have a new work about compressing multimodal models, i.e., making them more lightweight and friendly for custom-level devices to use. However, it seems that there isn't a proper subsection to cover this work. And it would be nice if there was a subsection about efficient multimodal models or something similar! Looking forward to your opinions on this or which of the existing subsections could include the work.

Paper: https://proceedings.mlr.press/v202/shi23e.html
Code: https://github.com/sdc17/UPop
Project: https://dachuanshi.com/UPop-Project/