add example request (#32)

templates/types/streaming/fastapi/app/api/routers/chat.py

@@ -17,6 +17,18 @@ class _Message(BaseModel):
     role: MessageRole
     content: str
 
+    class Config:
+        json_schema_extra = {
+            "example": {
+                "messages": [
+                    {
+                        "role": "user",
+                        "content": "How to tune a guitar?",
+                    }
+                ]
+            }
+        }
+
 
 class _ChatData(BaseModel):
     messages: List[_Message]