Refactor code structure for improved readability and maintainability

Dto/Template/Add/AddTemplateDto.cs

@@ -0,0 +1,22 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Microsoft.SelfService.Portal.Core.API.Dto.Template.Add
+{
+    public class AddTemplateDto
+    {
+        [Column(Order = 1)]
+        public Guid TemplateCategoryId { get; set; }
+
+        [Column(Order = 2)]
+        public string Name { get; set; }
+
+        [Column(Order = 3)]
+        public string Version { get; set; }
+
+        [Column(Order = 4)]
+        public string Description { get; set; }
+
+        [Column(Order = 5)]
+        public string JSONData { get; set; }
+    }
+}