Add project files.

UIFunctions.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Windows.Foundation.Metadata;
+
+namespace APIToolkit
+{
+    public class UIFunctions
+    {
+        public static void ShowError(XamlRoot parent, string message)
+        {
+            ContentDialog ThisDialog = new ContentDialog();
+
+            ThisDialog.XamlRoot = parent;
+            ThisDialog.Title = "Error";
+            ThisDialog.PrimaryButtonText = "Dismiss";
+            ThisDialog.Content = message;
+            ThisDialog.DefaultButton = ContentDialogButton.Primary;
+
+            var result = ThisDialog.ShowAsync();
+
+        }
+    }
+}