add sourcelink

Rx.NET/Source/Directory.build.props

@@ -18,5 +18,13 @@
     <DefaultLanguage>en-US</DefaultLanguage>
     <WriteVersionInfoToBuildLog>false</WriteVersionInfoToBuildLog>
   </PropertyGroup>
-    
+  
+    <ItemGroup>
+    <PackageReference Include="GitVersionTask" Version="4.0.0-beta0011" PrivateAssets="All" />
+    <PackageReference Include="MSBuild.Sdk.Extras" Version="1.0.0" PrivateAssets="All" />
+    <PackageReference Include="SourceLink.Create.GitHub" Version="2.1.0-b412" PrivateAssets="All" /> 
+    <DotNetCliToolReference Include="dotnet-sourcelink-git" Version="2.1.0-b412" /> 
+  </ItemGroup>
+  
+  
 </Project>

Rx.NET/Source/Directory.build.targets

@@ -1,9 +1,10 @@
 <Project>  
-
+  <!-- This has to be set in targets as the default props will overwrite -->
   <PropertyGroup>
     <DebugType>embedded</DebugType>
   </PropertyGroup>
   
+  <!-- This props all need to be set in targets as they depend on the values set earlier -->
   <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard1.3'">
     <DefineConstants>$(DefineConstants);NO_EVENTARGS_CONSTRAINT;HAS_WINRT;PREFER_ASYNC;USE_TIMER_SELF_ROOT;HAS_TPL46;NO_REMOTING;NO_SERIALIZABLE;CRIPPLED_REFLECTION</DefineConstants>
   </PropertyGroup>
@@ -19,12 +20,7 @@
   <PropertyGroup Condition="'$(TargetFramework)' == 'netcoreapp1.0' or '$(TargetFramework)' == 'netcoreapp1.1'">
     <DefineConstants>$(DefineConstants);NO_EVENTARGS_CONSTRAINT;HAS_WINRT;PREFER_ASYNC;USE_TIMER_SELF_ROOT;HAS_TPL46;NO_REMOTING;NO_SERIALIZABLE;CRIPPLED_REFLECTION</DefineConstants>    
   </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="GitVersionTask" Version="4.0.0-beta0011" PrivateAssets="All" />
-    <PackageReference Include="MSBuild.Sdk.Extras" Version="1.0.0" PrivateAssets="All" />
-  </ItemGroup>
-
+  
   <!-- UWP -->
   <ItemGroup Condition=" '$(TargetFramework)' == 'uap10.0' ">
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform " Version="5.2.2" />

Rx.NET/Source/NuGet.Config

@@ -4,5 +4,6 @@
     <add key="xUnit CI" value="https://www.myget.org/F/xunit/api/v3/index.json" />
     <add key="Build Packages" value="https://www.myget.org/F/c037199d-41df-4567-b966-25ff65324688/api/v3/index.json" />
     <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="sourcelink" value="https://ci.appveyor.com/nuget/sourcelink/" /> 
   </packageSources>
 </configuration>