Add chapter 10 sample project

Chapter10/TemplateStudioSampleApp/Helpers/RuntimeHelper.cs

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+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace TemplateStudioSampleApp.Helpers;
+
+public class RuntimeHelper
+{
+    [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
+    private static extern int GetCurrentPackageFullName(ref int packageFullNameLength, StringBuilder? packageFullName);
+
+    public static bool IsMSIX
+    {
+        get
+        {
+            var length = 0;
+
+            return GetCurrentPackageFullName(ref length, null) != 15700L;
+        }
+    }
+}