Added missing package description.

Author: tillig

src/Autofac.Pooling/Autofac.Pooling.csproj

@@ -18,6 +18,7 @@
 
   <!-- Nuget Options -->
   <PropertyGroup>
+    <Description>Support for pooled instance lifetime scopes in Autofac dependency injection.</Description>
     <PackageTags>autofac;di;ioc;dependencyinjection;pooling</PackageTags>
     <PackageReleaseNotes>Release notes are at https://github.com/autofac/Autofac.Pooling/releases</PackageReleaseNotes>
     <PackageIconUrl>https://cloud.githubusercontent.com/assets/1156571/13684110/16b8f152-e6bf-11e5-84ae-22c66c6d351a.png</PackageIconUrl>