A generic class that contains data and status about loading this data.

Resource.kt

sealed class Resource<T>(
   val data: T?
) {
   class Success<T>(data: T) : Resource<T>(data)
   class Loading<T>(data: T? = null) : Resource<T>(data)
   class Error<T>(throwable: Throwable, data: T? = null) : Resource<T>(data)
}