Initial split of the modules

NadekoBot.Core/Services/Database/Models/CurrencyTransaction.cs

@@ -0,0 +1,9 @@
+namespace NadekoBot.Services.Database.Models
+{
+    public class CurrencyTransaction : DbEntity
+    {
+        public long Amount { get; set; }
+        public string Reason { get; set; }
+        public ulong UserId { get; set; }
+    }
+}