add tokenizer

added_tokens.json

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+{"<|endoftext|>": 50257, "\n": 50258}

special_tokens_map.json

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+{"bos_token": "<|endoftext|>", "eos_token": "<|endoftext|>", "unk_token": "<|endoftext|>"}

tokenizer_config.json

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+{"unk_token": "<|endoftext|>", "bos_token": "<|endoftext|>", "eos_token": "<|endoftext|>", "add_prefix_space": false, "special_tokens_map_file": null, "name_or_path": "imthanhlv/gpt2news", "tokenizer_class": "GPT2Tokenizer"}