Add better help text

ArcToolkitCLI/Commands/Converters/NeiConverter.cs

@@ -179,7 +179,9 @@ namespace ArcToolkitCLI.Commands.Converters
             return 0;
         }
 
+        [Value(0, HelpText = "Input NEI or CSV files")]
         public IEnumerable<string> Input { get; set; }
+
         public string Output { get; set; }
 
         [Option('s', "separator", Default = ";", HelpText = "Value separator of the CSV file")]