Added Espresso Tests and other configuration settings for TippyTipper
WIP: Implemented Espresso UI Tests for given use-cases of Tippy-Tipper
Usecases:
- Tip calculation(percent inclusive)
- Bill-split between various persons
Tests:
- TrinkgeldBerechnungTest- to calculate the tip(percentage inclusive).
- RechnungAufteilungsTest- to split the bill between various persons.