ProfilScreen -> ProfileScreen

MainScreen Methoden um verschiedene Screens anzuzeigen
Merge branch 'master' of https://github.com/Asmayra/SoPra.git
Merge branch 'master' of https://github.com/Asmayra/SoPra.git
Merge branch 'master' of https://github.com/Asmayra/SoPra.git