Add some navigation sample

[hmshohrab]

Add some navigation samples like below

@Serializable
data object LoginRoute

fun NavController.navigateToLogin(
    navOptions: NavOptionsBuilder.() -> Unit = {}
) {
    navigate(route = LoginRoute) {
        navOptions()
    }
}

@OptIn(KoinExperimentalAPI::class)
fun NavGraphBuilder.loginScreen(
    navController: NavController,
    showBackButton: Boolean,
    onRenameBookClick: (BookItem) -> Unit,
    onDeleteBookClick: (BookItem) -> Unit,
    onBackClick: () -> Unit
) {
    composable<LoginRoute> {
        val viewModel = koinViewModel<AuthVM>()

        TopCenterContainer {
            ScaffoldWithSnackbar {
                LoginScreenIndex(
                    authVM = viewModel,
                    navigateToMain = {
                        navController.navigateToMain {
                            popUpTo(LoginRoute) {
                                inclusive = true
                            }
                        }
                    })
            }

        }
    }
}