✅ add coverlet.collector package reference for code coverage

Author: techouse

QsNet.Tests/QsNet.Tests.csproj

@@ -17,6 +17,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
+        <PackageReference Include="coverlet.collector" Version="6.0.4" />
     </ItemGroup>
     <ItemGroup>
         <ProjectReference Include="..\QsNet\QsNet.csproj"/>