Add import of polygon from dxf

StructureHelperCommon/Services/Exports/IImportFromFileLogic.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Services.Exports
+{
+    public interface IImportFromFileLogic : IImportLogic
+    {
+        string FileName { get; set; }
+    }
+}