Kotlin App - add preferences to the application

[omrisarig13]

Add a new button to the application that will let the user save and update the preferences in the application.

Currently, there should be only one preference in the app - the number of questions to ask at each level in the test. Currently, it is saved statically as 5, it is better to change it and let the user choose for himself how many questions he wants per know level.

The preferences should be saved between running on the app (can be saved to a file, like the dictionary is currently saved). In the future, there might be more preferences that will be added to this menu, should it should be possible to do it.