📝 Add first tutorial src files

docs/tutorial/src/tutorial27.py

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+from fastapi import FastAPI, Query, Path
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str = None
+    price: float
+    tax: float = None
+
+
+class User(BaseModel):
+    username: str
+    full_name: str = None
+
+
+@app.put("/items/{item_id}")
+async def update_item(
+    *,
+    item_id: int,
+    item: Item,
+    user: User,
+):
+    results = {"item_id": item_id, "item": item, "user": user}
+    return results