public async Task PostUser()
{
var userToCreate = new CreateUser
{
Email = "Oryx",
FirstName = "Anton",
LastName = "Tsvetanov",
HouseholdId = 3
};
var requestContent = new StringContent(userToCreate.ToJson(), Encoding.UTF8, "application/json");
var response = await _client.PostAsync($"/users", requestContent);
var responseContent = await response.Content.ReadAsStringAsync();
var actualUser = CreateUser.FromJson(responseContent);