public async Task <DefaultResponse> Cadastrar(string roleName)
{
var role = new IdentityRole(roleName);
var roleNameJson = role.SerializeToJson();
var response = await _httpClient.PostAsync("api/roles", new StringContent(roleNameJson, Encoding.UTF8, "application/json"));
return((await response.Content.ReadAsStringAsync()).DeserializeJsonToObject <DefaultResponse>());
}
