added ChatML template from OpenHermes-2.5-Mistral-7B (#2)

- added ChatML template from OpenHermes-2.5-Mistral-7B (a5f7495cba31118d571e6a519cdcac47a81e1189)


Co-authored-by: itsuka <itsuka@users.noreply.huggingface.co>

tokenizer_config.json

@@ -45,6 +45,7 @@
   },
   "additional_special_tokens": [],
   "bos_token": "<s>",
+  "chat_template": "{% for message in messages %}{{'<|im_start|>' + message['role'] + '\n' + message['content'] + '<|im_end|>' + '\n'}}{% endfor %}{% if add_generation_prompt %}{{ '<|im_start|>assistant\n' }}{% endif %}",
   "clean_up_tokenization_spaces": false,
   "eos_token": "<|im_end|>",
   "legacy": true,