#256 - added Settings entity, service, repository and advice

...a/de/deadlocker8/budgetmaster/advices/SettingsAdvice.java

...adlocker8/budgetmaster/controller/CategoryController.java

...n/java/de/deadlocker8/budgetmaster/entities/Settings.java

...locker8/budgetmaster/repositories/SettingsRepository.java

...de/deadlocker8/budgetmaster/services/SettingsService.java

.../java/de/deadlocker8/budgetmaster/utils/LanguageType.java