chore: refactoring some code to introduce a common base class for all api classes

src/Shared/BaseModel.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace Novaloop.PaymoApi.Shared
+{
+    public class BaseModel
+    {
+        public int Id { get; set; }
+        public DateTime CreatedOn { get; set; }
+        public DateTime UpdatedOn { get; set; }
+    }
+}