commit: some new files
main structure finished.
TODO:
* Finish the feature of downloading
try to make debug...
debugging...
Status:
* Currently: sometimes fine at www.pixiv.com, www.pixiv.net will be failed
* TODO: create a notification and try to debug why cannot download from
* pixiv.com|net
final version, will add some features for user experience
remove old and not be used file(s).
final version