first commit

Presentation/IUserDialogService.cs

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+using System.Collections.Generic;
+using System.Windows.Forms;
+using DCIT.Core.Models;
+
+namespace DCIT.App.Presentation
+{
+    public interface IUserDialogService
+    {
+        DialogResult ShowMessage(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon);
+
+        AutoExtractPreviewResult ShowAutoExtractPreview(IWin32Window owner, IList<ExtractionCandidate> candidates);
+    }
+
+    public sealed class AutoExtractPreviewResult
+    {
+        public DialogResult DialogResult { get; set; }
+
+        public IList<ExtractionCandidate> SelectedCandidates { get; set; } = new List<ExtractionCandidate>();
+    }
+}