[Research] Create a PoC app with various progress button types

[aniri]

A major issue of the app is the lack of feedback when saving the answer to a question.

Please test various kinds of progress buttons and include them in the MV app or in a separate example app. The examples will be used during the upcoming UX redesign of the app :)

Some ideas:

• https://proandroiddev.com/replace-progressdialog-with-a-progress-button-in-your-app-14ed1d50b44
• https://mindorks.com/android/store/Animations/leandroborgesferreira/loadingbuttonandroid