`init` command to create directory/settings/hooks files

[justincampbell]

From #22

$ pomodoro init
Created ~/.pomodoro/settings
Created ~/.pomodoro/hooks/start
Created ~/.pomodoro/hooks/stop
# ... etc
Done!

[Munchotaur]

I'd love this if we can also specify a target directory -- I prefer application configs in ~/.config/some_appname/

[justincampbell]

I haven't been actively using it due to my current dev setup at work, but I'd happily review/approve a PR if someone wants to attempt this

[pataquets]

Some XDG_CONFIG/.pomodororc configuration file where to specify the data dir would be great, too (#16?).