Implement CurrentPrice Writer service

RhSolutions.AddIn/Services/CurrentPriceWriter.cs

@@ -0,0 +1,19 @@
+#if !NET472
+using System.Runtime.Versioning;
+using RhSolutions.Tools;
+#endif
+
+
+namespace RhSolutions.Services;
+
+public class CurrentPriceWriter : ExcelWriterBase, IWriter, IDisposable
+{
+    public CurrentPriceWriter(Application application, IAddInConfiguration configuration)
+    {
+        _application = application;
+        _resultBar = new();
+        _headers = configuration.GetPriceListHeaders();
+        _worksheet = _application.ActiveSheet;
+        _appendValues = false;
+    }
+}