📝 Update docs, add first tutorials

docs/tutorial/src/all/tutorial042.py

@@ -0,0 +1,20 @@
+from typing import Set
+
+from fastapi import FastAPI
+from pydantic import BaseModel
+from starlette.status import HTTP_201_CREATED
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str = None
+    price: float
+    tax: float = None
+    tags: Set[str] = []
+
+
+@app.post("/items/", response_model=Item, status_code=HTTP_201_CREATED)
+async def create_item(*, item: Item):
+    return item