docs: add readme

README.md

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+---
+language: ko
+---
+
+# KLUE RoBERTa base
+
+Pretrained RoBERTa Model on Korean Language. See [Github](https://github.com/KLUE-benchmark/KLUE) and [Paper](https://arxiv.org/abs/2105.09680) for more details.
+
+## How to use
+
+_NOTE:_ Use `BertTokenizer` instead of RobertaTokenizer. (`AutoTokenizer` will load `BertTokenizer`)
+
+```python
+from transformers import AutoModel, AutoTokenizer
+
+model = AutoModel.from_pretrained("klue/roberta-base")
+tokenizer = AutoTokenizer.from_pretrained("klue/roberta-base")
+```