val scope = rememberCoroutineScope()
val scaffoldState = rememberScaffoldState()
.
.
.
scaffoldState = scaffoldState,
floatingActionButton = {
    FloatingActionButton(
        onClick = {
            scope.launch {
                scaffoldState.snackbarHostState.showSnackbar("Hello there!")
            }
        },
        content = {
            Icon(imageVector = Icons.Default.Favorite, contentDescription = "")
        }
    )
}