📝 Update docs, add first tutorials

docs/tutorial/src/all/tutorial001.py

@@ -0,0 +1,11 @@
+from fastapi import FastAPI, Query
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(q: str = Query(None, max_length=50)):
+    results = {"items": [{"item_id": "Foo"}, {"item_id": "Bar"}]}
+    if q:
+        results.update({"q": q})
+    return results