Added RelativePath to the UI

Author: Ellested

samples/Sample.Core/Pages/MultiFile.razor

@@ -23,6 +23,7 @@
                 Size: <strong>@file.Size bytes</strong>;
                 Last modified: <strong>@file.LastModified.ToShortDateString()</strong>;
                 Type: <strong>@file.Type</strong>
+                Relative Path: <strong>@file.RelativePath</strong>
             </div>
 
             <!-- Upload button -->