Add default chat template to tokenizer_config.json

tokenizer_config.json

@@ -8,5 +8,6 @@
   "model_max_length": 2048,
   "name_or_path": "tiiuae/falcon_tokenizer",
   "special_tokens_map_file": null,
-  "tokenizer_class": "PreTrainedTokenizerFast"
-}
+  "tokenizer_class": "PreTrainedTokenizerFast",
+  "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 %}"
+}