KPF-BERT attribution notice

This model is fine-tuned from KPF/KPF-bert-ner. The upstream KPF-BERT project
is maintained by the Korea Press Foundation / KPF-bigkinds project. See:
https://huggingface.co/KPF/KPF-bert-ner
https://github.com/KPF-bigkinds/BIGKINDS-LAB
https://github.com/KPFBERT/kpfbert

Upstream copyright notices to retain:
- Copyright (c) 2021 KPFBERT
- Copyright (c) 2022 빅카인즈랩

The upstream KPF/KPF-bert-ner Hugging Face card does not currently expose an
explicit license metadata field. Users distributing or deploying this
derivative should verify the upstream terms in addition to this repository's
MIT license for the original fine-tuning artifacts.