Model card: correct licence metadata, add LICENSE, link windytranslate.com

base_model -> true upstream origin (openai/whisper-medium)

add NOTICE — derivative work, upstream attribution

add upstream apache-2.0 licence text (required by the licence)

correct licence to apache-2.0 (matches upstream base)

provenance card

promote from WindstormLabs/windy-plus-ggml@f5455a462ab4

initial commit