Update Yolov4 sample to use the NuGet

Author: nums11

Samples/Tutorial Samples/YOLOv4ObjectDetection/YOLOv4ObjectDetection/Model.cs

@@ -4,10 +4,10 @@
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-using Windows.AI.MachineLearning;
 using Windows.Media;
 using Windows.Storage;
 using Windows.UI.Xaml;
+using Microsoft.AI.MachineLearning;
 
 namespace YOLOv4ObjectDetection
 {

Samples/Tutorial Samples/YOLOv4ObjectDetection/YOLOv4ObjectDetection/YOLOv4ObjectDetection.csproj

@@ -152,6 +152,9 @@
     </Page>
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="Microsoft.AI.MachineLearning">
+      <Version>1.13.1</Version>
+    </PackageReference>
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform">
       <Version>6.2.10</Version>
     </PackageReference>