public void TestMethod1()
        {

            var configurationManager = new ConfigurationManager(new AppSettingsProvider());
            configurationManager.UseAzureKeyVault(
                new AzureKeyVaultSettingsProviderOptions
                {
                    ConfigurationManager = configurationManager,
                    SecretConverter = DecryptEnvelop
                });
            
            var test = configurationManager.GetAzureKeyVaultSecret("storage");
            Console.WriteLine(test.Value);

        }
        // This method gets called by a runtime.
        // Use this method to add services to the container
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();

            var configurationManager = new ConfigurationManager(new AppSettingsProvider());
            configurationManager.UseAzureKeyVault(
                new AzureKeyVaultSettingsProviderOptions
                {
                    ConfigurationManager = configurationManager,
                    SecretConverter = DecryptEnvelop
                });
            services.AddInstance(configurationManager);
            // Uncomment the following line to add Web API services which makes it easier to port Web API 2 controllers.
            // You will also need to add the Microsoft.AspNet.Mvc.WebApiCompatShim package to the 'dependencies' section of project.json.
            // services.AddWebApiConventions();
        }