Add Korean documentation for BitNet

[samuggi]

This commit introduces three new files:

1. README_ko.md: A Korean translation of the original README.md.
2. Pretrain-Tuning.md: A document in Korean outlining methods and considerations for pretraining BitNet language models, with a focus on Korean language data. It highlights that BitNet models are trained from scratch with ternary weights.
3. SFT-Tuning.md: A document in Korean detailing Supervised Fine-Tuning (SFT) techniques for Korean BitNet models, including dataset preparation and the training process.

These documents aim to provide you with essential information about understanding, pretraining, and fine-tuning BitNet models.

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