Is there any clever solution to store static files in Flask's application root directory.
robots.txt and sitemap.xml are expected to be found in /, so my idea was to create routes for them:

```
@app.route('/sitemap.xml', methods=['GET'])
def sitemap():
  response = make_response(open('sitemap.xml').read())
  response.headers["Content-type"] = "text/plain"
  return response

```

There must be something more convenient :)