MainViewModel.kt

class MainViewModel : ViewModel() {

    private lateinit var users: MutableLiveData<List<User>>

    fun getUsers(): LiveData<List<User>> {
        if (!::users.isInitialized) {
            users = MutableLiveData()
            // TODO loading of the data (hopefully using coroutines)
            users.postValue(arrayListOf(
                User(login = "user.name1"),
                User(login = "user.name2")
            ))
        }
        return users
    }

}