IReport is added

Services/Reports/IReport.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelper.Services.Reports
+{
+    public interface IReport
+    {
+        void Prepare();
+        void ShowPrepared();
+        void Show();
+    }
+}