private async Task Add(ViewContact contact)
{
var response = await httpClient.GetAsync($"/api/Contacts/add/{contact.Contact.Id}");
response.EnsureSuccessStatusCode();
var json = await response.Content.ReadAsStringAsync();
var contactViewModel = JsonConvert.DeserializeObject <ContactViewModel>(json);
contact.UserAccepted = Shared.ReferentielTable.EnumUserAccepted.PENDING;
await InvokeAsync(StateHasChanged);
await NotificationClient.SendNotificationsToUser(contactViewModel.Notification, contact.UserId);
}