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https://stackoverflow.com/questions/1539958/wpf-showing-dialog-before-main-window
https://stackoverflow.com/questions/1539958/wpf-showing-dialog-before-main-window/9371283
https://stackoverflow.com/questions/5708992/if-the-user-logs-on-successfully-then-i-want-to-show-the-main-window-if-not-i/5710535
https://code.i-harness.com/en/q/177f76
https://social.msdn.microsoft.com/Forums/vstudio/en-US/15c323bf-22f5-44af-bd39-f25297760770/popup-a-window-before-the-mainwindow?forum=wpf
https://docs.microsoft.com/de-de/dotnet/api/system.windows.application.startup
https://www.telerik.com/forums/main-window-in-background-after-closing-a-radwindow
https://www.codeproject.com/Questions/805914/WPF-When-I-a-Call-a-New-Window-Its-Blank
https://mahapps.com/guides/quick-start.html
https://codereview.stackexchange.com/questions/20871/single-instance-wpf-application
https://www.oreilly.com/library/view/programming-wpf-2nd/9780596510374/ch01.html
https://auth0.com/blog/add-auth-to-native-desktop-csharp-apps-with-jwt/
https://books.google.de/books?id=znAVMHNSen0C&pg=PA199&lpg=PA199&dq=only+show+mainwindow+when+login+is+right+wpf