evaluations/fidkid-pytorch/3d-metrics/evals/readme.md

All metrics: p-FID, p-KID, p-IS

Mainly copied from ```https://github.com/openai/point-e/point_e/evals/```.

The p-KID is copied from ```https://github.com/3dlg-hcvc/omages/blob/main/src/evals/fpd_eval.py```