gpt oss harmony template

kcpp_adapters/OpenAI-Harmony.json

@@ -0,0 +1,8 @@
+{
+  "system_start": "<|start|>system<|message|>",
+  "system_end": "<|end|>\n",
+  "user_start": "<|start|>user<|message|>",
+  "user_end": "<|end|>\n",
+  "assistant_start": "<|start|>assistant<|channel|>final<|message|>",
+  "assistant_end": "<|return|>\n"
+}