Update example web project to run as a .NET Core App.

Author: ngbrown

src/NHibernate.Example.Web/NHibernate.Example.Web.csproj

@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net461</TargetFramework>
+    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
+    <DisableImplicitPackageTargetFallback>true</DisableImplicitPackageTargetFallback>
   </PropertyGroup>
 
   <ItemGroup>
@@ -19,6 +20,10 @@
     <PackageReference Include="Serilog.Sinks.Console" Version="3.1.0" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetFramework)'=='netcoreapp2.0'">
+    <PackageReference Include="System.Data.SqlClient" Version="4.4.2" />
+  </ItemGroup>
+
   <ItemGroup>
     <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
   </ItemGroup>