Add import of polygon from dxf

StructureHelperCommon/Services/Exports/FileIOInputData.cs

@@ -0,0 +1,9 @@
+namespace StructureHelperCommon.Services.Exports
+{
+    public class FileIOInputData : IFileIOnputData
+    {
+        public string FileName { get; set; } = "New file";
+        public string Filter { get; set; }
+        public string Title { get; set; }
+    }
+}