Add symbols package setting to csproj

Author: Mafii

CompositionRoot/CompositionRoot.csproj

@@ -20,6 +20,8 @@
         <PackageLicenseExpression>MIT OR Apache-2.0</PackageLicenseExpression>
         <Copyright>© Messerli Informatik AG. All rights reserved.</Copyright>
         <PackageTags>composition root</PackageTags>
+        <IncludeSymbols>true</IncludeSymbols>
+        <SymbolPackageFormat>snupkg</SymbolPackageFormat>
     </PropertyGroup>
     <ItemGroup>
         <PackageReference Include="Autofac" />