Migrate model card from transformers-repo

Read announcement at https://discuss.huggingface.co/t/announcement-all-model-cards-will-be-migrated-to-hf-co-model-repos/2755
Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/monologg/koelectra-base-generator/README.md

README.md

@@ -0,0 +1,45 @@
+---
+language: ko
+---
+
+# KoELECTRA (Base Generator)
+
+Pretrained ELECTRA Language Model for Korean (`koelectra-base-generator`)
+
+For more detail, please see [original repository](https://github.com/monologg/KoELECTRA/blob/master/README_EN.md).
+
+## Usage
+
+### Load model and tokenizer
+
+```python
+>>> from transformers import ElectraModel, ElectraTokenizer
+
+>>> model = ElectraModel.from_pretrained("monologg/koelectra-base-generator")
+>>> tokenizer = ElectraTokenizer.from_pretrained("monologg/koelectra-base-generator")
+```
+
+### Tokenizer example
+
+```python
+>>> from transformers import ElectraTokenizer
+>>> tokenizer = ElectraTokenizer.from_pretrained("monologg/koelectra-base-generator")
+>>> tokenizer.tokenize("[CLS] 한국어 ELECTRA를 공유합니다. [SEP]")
+['[CLS]', '한국어', 'E', '##L', '##EC', '##T', '##RA', '##를', '공유', '##합니다', '.', '[SEP]']
+>>> tokenizer.convert_tokens_to_ids(['[CLS]', '한국어', 'E', '##L', '##EC', '##T', '##RA', '##를', '공유', '##합니다', '.', '[SEP]'])
+[2, 18429, 41, 6240, 15229, 6204, 20894, 5689, 12622, 10690, 18, 3]
+```
+
+## Example using ElectraForMaskedLM
+
+```python
+from transformers import pipeline
+
+fill_mask = pipeline(
+    "fill-mask",
+    model="monologg/koelectra-base-generator",
+    tokenizer="monologg/koelectra-base-generator"
+)
+
+print(fill_mask("나는 {} 밥을 먹었다.".format(fill_mask.tokenizer.mask_token)))
+```