add chat template

tokenizer_config.json

@@ -49,6 +49,7 @@
   "eos_token": "<|im_end|>",
   "legacy": true,
   "model_max_length": 1000000000000000019884624838656,
+  "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 %}",
   "pad_token": null,
   "sp_model_kwargs": {},
   "spaces_between_special_tokens": false,