Python Flask의 기본 골격을 만들어 주기

https://github.com/enwawerueli/flask-skeleton

create-flask-app --help
Usage: create-flask-app [OPTIONS] APPNAME

  Create a flask app skeleton.

Options:
  -d, --dest PATH   Where to create your app. Defaults to the current
                    directory.
  -v, --virtualenv  Create a virtual environment.
  -g, --git         Initialize a git repository.
  -V, --version     Show the version and exit.
  -h, --help        Show this message and exit.