add comments to title and subtitle properties

Author: jjw24

Flow.Launcher.Plugin/Result.cs

@@ -13,8 +13,14 @@ public class Result
 
         private string _icoPath;
 
+        /// <summary>
+        /// Provides the title of the result. This is always required.
+        /// </summary>
         public string Title { get; set; }
 
+        /// <summary>
+        /// Provides additional details for the result. This is optional
+        /// </summary>
         public string SubTitle { get; set; } = string.Empty;
 
         /// <summary>