Include an option to select between the CLI (argparse or Click)

[alvarobartt]

So as to let the user decide which CLI wants to use, an option should be included into the cookiecutter config and its respective implementation should be developed. Currently the default CLI to be used is argparse, but since Click is also widely used its implementation could be useful.

[gabrielmbmb]

I think we should migrate from argparse to Click, because Flask comes with Click integrated by default which will let the user to execute a command with the Flask client:

flask [command]