✨ Add HTTPException with custom headers (#35)

* 📝 Update Release Notes with issue templates

* ✨ Add HTTPException with support for headers

Including docs and tests

* 📝 Update Security docs to use new HTTPException

docs/src/handling_errors/tutorial001.py

@@ -0,0 +1,12 @@
+from fastapi import FastAPI, HTTPException
+
+app = FastAPI()
+
+items = {"foo": "The Foo Wrestlers"}
+
+
+@app.get("/items/{item_id}")
+async def create_item(item_id: str):
+    if item_id not in items:
+        raise HTTPException(status_code=404, detail="Item not found")
+    return {"item": items[item_id]}