Update proj to include nuget and signing key info

Rx.NET/Source/System.Reactive/System.Reactive.csproj

@@ -2,11 +2,23 @@
   <PropertyGroup>
     <TargetFrameworks>netstandard1.3;net45;net46;uap10.0</TargetFrameworks>
     <Product>System.Reactive ($(TargetFramework))</Product>
+    <Copyright>Copyright (c) .NET Foundation and Contributors.</Copyright>
     <CopyLocalLockFileAssemblies>false</CopyLocalLockFileAssemblies>
     <DefaultLanguage>en-US</DefaultLanguage>
     <MinClientVersion>2.12</MinClientVersion>
     <GenerateDocumentationFile Condition=" '$(Configuration)' == 'Release' ">true</GenerateDocumentationFile>
-  </PropertyGroup>
+    <Authors>.NET Foundation and Contributors</Authors>
+    <AssemblyOriginatorKeyFile>../ReactiveX.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>true</SignAssembly>
+    <NoWarn>$(NoWarn);CS1591</NoWarn>
+    <PublicSign Condition=" '$(OS)' != 'Windows_NT' ">true</PublicSign>
+    <PackageTags>Rx;Reactive;Extensions;Observable;LINQ;Events</PackageTags>
+    <PackageIconUrl>http://go.microsoft.com/fwlink/?LinkId=261274</PackageIconUrl>
+    <PackageProjectUrl>http://go.microsoft.com/fwlink/?LinkId=261273</PackageProjectUrl>
+    <PackageLicenseUrl>http://go.microsoft.com/fwlink/?LinkID=261272</PackageLicenseUrl>
+    <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
+    <Description>Reactive Extensions (Rx) for .NET</Description>
+  </PropertyGroup>  
   <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard1.3'">
     <DefineConstants>$(DefineConstants);NO_EVENTARGS_CONSTRAINT;HAS_EDI;HAS_WINRT;HAS_PROGRESS;PREFER_ASYNC;HAS_AWAIT;HAS_APTCA;USE_TIMER_SELF_ROOT;HAS_TPL46;NO_REMOTING;NO_SERIALIZABLE;CRIPPLED_REFLECTION;PLIB</DefineConstants>
     <AssemblyVersion>4.0.3000.0</AssemblyVersion>
@@ -68,12 +80,12 @@
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' or '$(TargetFramework)' == 'uap10.0' ">
     <PackageReference Include="NETStandard.Library" Version="1.6.1" />
     <PackageReference Include="System.ComponentModel" Version="4.3.0" />
-    <PackageReference Include="System.Diagnostics.Contracts" Version="4.3.0" />
     <PackageReference Include="System.Dynamic.Runtime" Version="4.3.0" />    
     <PackageReference Include="System.Linq.Queryable" Version="4.3.0" />
-    <PackageReference Include="System.Runtime.InteropServices.WindowsRuntime" Version="4.3.0" />
   </ItemGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">
+  <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard1.3' ">    
+    <PackageReference Include="System.Diagnostics.Contracts" Version="4.3.0" />
+    <PackageReference Include="System.Runtime.InteropServices.WindowsRuntime" Version="4.3.0" />
     <PackageReference Include="System.Threading.Thread" Version="4.3.0" />
     <PackageReference Include="System.Threading.ThreadPool" Version="4.3.0" />
   </ItemGroup>