Add official LIEPA-3 project information

Add phon config metadata

Clarify published LIEPA-3 configs in README

Add dataset_info with per-config features using exact working nested dtype format for audio

Revert README to original working version — HF auto-detects audio from Parquet structure

Declare full feature list so datasets-server applies audio dtype override to the audio struct column

Restructure README YAML to match working audio dataset pattern

Add sampling_rate to audio dtype so HF Viewer renders audio player

Use correct dataset_info YAML format for Audio rendering in HF Viewer

Fix README YAML so HF Viewer renders audio properly

Fix README data_fields so HF Viewer renders audio properly

Upload README.md

Declare audio feature for dataset viewer

Add provisional dataset card for read config