Translation to Korean

Hi there 👋

Let's translate the course to Korean so that the whole community can benefit from this resource 🌎!

Below are the chapters and files that need translating - let us know here if you'd like to translate any. Once you're finished, open a pull request and tag this issue by including `#issue-number` in the description, where `issue-number` is the number of this issue.

> 🙋 If you'd like others to help you with the translation, you can also post in our [forums](https://discord.com/channels/879548962464493619/1105153909552586812).

This [PR template](https://gist.github.com/gabrielwithappy/110670632d3d337cf01636733f0fce0d) from @gabrielwithappy might help.

## Chapters

**Unit 0: Welcome to the course!**

- [x] [`introduction.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter0/introduction.mdx)
- [x] [`get_ready.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter0/get_ready.mdx)
- [x] [`Community.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter0/community.mdx)

**Unit 1: Working with audio data**

- [x] [`introduction.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter1/introduction.mdx)
- [x] [`audio_data.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter1/audio_data.mdx)
- [x] [`load_and_explore.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter1/load_and_explore.mdx)
- [x] [`preprocessing.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter1/preprocessing.mdx)
- [x] [`streaming.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter1/streaming.mdx)
- [x] [`quiz.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter1/quiz.mdx)
- [x] [`supplemental_reading.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter1/supplemental_reading.mdx)

**Unit 2: A gentle introduction to audio applications**

- [x] [`introductoin.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter2/introduction.mdx)
- [x] [`audio_classification_pipeline.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter2/audio_classification_pipeline.mdx)
- [x] [`asr_pipeline.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter2/asr_pipeline.mdx)
- [x] [`hands_on.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter2/hands_on.mdx)

**Unit 3: Transformer architectures for audio**

- [x] [`introduction.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter3/introduction.mdx)
- [x] [`ctc.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter3/ctc.mdx)
- [x] [`seq2seq.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter3/seq2seq.mdx)
- [x] [`classification.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter3/classification.mdx)
- [x] [`quiz.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter3/quiz.mdx)
- [x] [`supplemental_reading.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter3/supplemental_reading.mdx)

**Unit 4: Build a music genre classifier**

- [ ] [`introduction.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter4/introduction.mdx)
- [ ] [`classification_models.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter4/classification_models.mdx)
- [ ] [`fine_tuning.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter4/fine_tuning.mdx)
- [ ] [`demo.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter4/demo.mdx)
- [ ] [`hands_on.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/chapter4/hands_on.mdx)

**Course Events**

- [x] [`introduction.mdx`](https://github.com/huggingface/audio-transformers-course/blob/main/chapters/en/events/introduction.mdx)

Start by reading the unchecked English sources in chapters/en/chapter4: introduction.mdx, classification_models.mdx, fine_tuning.mdx, demo.mdx, and hands_on.mdx. Translate those course chapters into Korean while preserving the existing MDX structure and review the completed checklist. Done means opening a pull request and referencing issue 67 in its description.

Written by the indexing model from the issue text.