Add a gaussian head work

[chiehwangs]

Hi,

Thank you for maintaining this excellent library！

Our latest 3D Gaussian based work has been announced, can it be added to this library? We built a refined head avatar based on dynamic explicit structures.

arXiv: https://arxiv.org/abs/2312.01632
github: https://github.com/chiehwangs/gaussian-head

best,
chieh

[janusch]

Thank you. We will add your and the other new research later today

[Henry Pearce]

Added, thankyou!