feature: stamp the code repository details in projects (#1720)

Author: glennawatson

src/Directory.build.props

@@ -9,6 +9,8 @@
     <Product>ReactiveUI ($(TargetFramework))</Product>
     <PackageTags>mvvm;reactiveui;rx;reactive extensions;observable;LINQ;events;frp;xamarin;android;ios;mac;forms;monodroid;monotouch;xamarin.android;xamarin.ios;xamarin.forms;xamarin.mac;xamarin.tvos;wpf;net;netstandard;net461;uwp;tizen</PackageTags>
     <PackageReleaseNotes>https://reactiveui.net/blog/</PackageReleaseNotes>
+    <RepositoryUrl>https://github.com/reactiveui/reactiveui</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
 
     <NoWarn>$(NoWarn);1591;1701;1702;1705</NoWarn>
     <GenerateDocumentationFile Condition=" '$(Configuration)' == 'Release' ">true</GenerateDocumentationFile>