Add project files.

NmeaMessages/NmeaMessage.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GpsClient2.NmeaMessages {
+    public abstract class NmeaMessage {
+        public abstract void Parse(string[] messageParts);
+    }
+}