Added NightAlert project for travel kit

NightscoutLibrary/Configuration/INightscoutAlertConfiguration.cs

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+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; }
+    }
+}

NightscoutLibrary/Configuration/MonoCompatibleNightscoutAlertConfiguration.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Text;
+
+namespace NightscoutLibrary.Configuration
+{
+    public class MonoCompatibleNightscoutAlertConfiguration : INightscoutAlertConfiguration
+    {
+        private String _nightscoutBaseURL;
+        public string APISecretKey { get; set; }
+
+        public MonoCompatibleNightscoutAlertConfiguration(String NightscoutBaseURL, String APISecretKey)
+        {
+            this.NightscoutBaseURL = NightscoutBaseURL;
+            this.APISecretKey = APISecretKey;
+        }
+        public string NightscoutBaseURL
+        {
+            get { return _nightscoutBaseURL; }
+            set
+            { 
+                _nightscoutBaseURL = value;
+                ResolveHostnameFromURL();
+            }
+        }
+
+
+        private void ResolveHostnameFromURL()
+        { //Convert any hostname notation into ip-address form to avoid Websocket4Net mono issue regarding hostnames
+            Uri nightscoutUri = new Uri(_nightscoutBaseURL);
+            String nightscoutHost = nightscoutUri.DnsSafeHost;
+            var hostInfo = Dns.GetHostEntry(nightscoutHost);
+            if(hostInfo.AddressList == null || !hostInfo.AddressList.Any())
+                throw new ApplicationException("An error occurred while resolving the Nightscout server address");
+            IPAddress address = hostInfo.AddressList.First();
+            _nightscoutBaseURL = _nightscoutBaseURL.Replace(nightscoutHost, address.ToString());
+        }
+    }
+}