Include README in NuGet package

Author: christianhelle

src/Atc.Azure.Messaging/Atc.Azure.Messaging.csproj

@@ -5,8 +5,13 @@
     <PackageId>Atc.Azure.Messaging</PackageId>
     <PackageTags>azure;eventhubs;servicebus</PackageTags>
 	  <Description>A component library for publishing messages on Azure Event Hubs and Service Bus.</Description>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Include="..\..\README.md" Pack="true" PackagePath="\"/>
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Atc.Azure.Options" Version="3.0.14" />
     <PackageReference Include="Azure.Messaging.EventHubs" Version="5.7.0" />