Added NightAlert project for travel kit

NightscoutLibrary/Configuration/INightscoutAlertConfiguration.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NightscoutLibrary.Configuration
+{
+    public interface INightscoutAlertConfiguration
+    {
+        String NightscoutBaseURL { get; set; }
+        String APISecretKey { get; set; }
+    }
+}