fix(v0.9.0): restore 3 backbones (mobilenet_v3_large, resnet50, resnet101) × {fp32,int8} from v0.8.0

Add stub root config.json for HF download counter

Add spec-compliant config.json files

Add spec-compliant config.json files

Restructure to MODEL_SPEC.md convention

Update models

Update models

Update README

Move the model

Upload deeplabV3_xnnpack_fp32.pte

Update README.md

initial commit