missing test project added

Author: asadsahi

tests/Integration/Integration.Tests.csproj

@@ -9,6 +9,7 @@
 	<ItemGroup>
 		<PackageReference Include="AngleSharp" Version="0.14.0" />
 		<PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.2" />
+		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
 		<PackageReference Include="xunit" Version="2.4.1" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
 			<PrivateAssets>all</PrivateAssets>