Android – ViewModels
- https://developer.android.com/topic/libraries/architecture/viewmodel
- https://proandroiddev.com/architecture-components-modelview-livedata-33d20bdcc4e9
- https://proandroiddev.com/mvvm-architecture-viewmodel-and-livedata-part-1-604f50cda1https://proandroiddev.com/mvvm-architecture-viewmodel-and-livedata-part-1-604f50cda1
- https://medium.com/@taman.neupane/basic-example-of-livedata-and-viewmodel-14d5af922d0