Point README to EmbodiedCity/ANWM.code on GitHub

Flatten checkpoint to 0200000.pth.tar; place via --local-dir on download

Place released ckpt at logs/anwm_cdit_airvln/checkpoints/0200000.pth.tar and add README

Upload checkpoints/nwm_cdit_airvln_v5_3/0200000.pth.tar with huggingface_hub

initial commit