migrating session/map it to guid.

Sledgemapper.Api/Commands/NewCampaignCommand.cs

@@ -0,0 +1,19 @@
+using System;
+using MediatR;
+
+namespace Sledgemapper.Api.Commands
+{
+    public class NewCampaignCommand : IRequest<bool>
+    {
+        public double Timestamp { get; private set; }
+        public string CampaignName { get; private set; }
+        public string UserId { get; private set; }
+        public NewCampaignCommand(string campaingName, string userId)
+        {
+            Timestamp = DateTimeOffset.Now.ToUnixTimeMilliseconds();
+            CampaignName = campaingName;
+            UserId = userId;
+        }
+    }
+
+}