Adding xml docs

Author: StanleyGoldman

src/GitHub.InlineReviews/Services/ICommentService.cs

@@ -1,7 +1,14 @@
 namespace GitHub.InlineReviews.Services
 {
+    /// <summary>
+    /// This service allows for functionality to be injected into the chain of different peek Comment ViewModel types.
+    /// </summary>
     public interface ICommentService
     {
+        /// <summary>
+        /// This function uses MessageBox.Show to display a confirmation if a comment should be deleted.
+        /// </summary>
+        /// <returns></returns>
         bool ConfirmCommentDelete();
     }
 }