add tokenizer

added_tokens.json

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+{"<mask>": 20000, "<bos>": 20001, "<eos>": 20002}

special_tokens_map.json

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+{"bos_token": "<bos>", "eos_token": "<eos>", "unk_token": "<|endoftext|>", "mask_token": "<mask>"}

tokenizer_config.json

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+{"unk_token": "<|endoftext|>", "bos_token": "<|endoftext|>", "eos_token": "<|endoftext|>", "add_prefix_space": false, "model_max_length": 1024, "special_tokens_map_file": null, "name_or_path": "gpt2", "tokenizer_class": "GPT2Tokenizer"}