The Asp.net documentation is still in progress and it is not always accurate or up to date. If you try to work with SecretManager and beta7 you might find trouble installing it.
The documentation states: Run the command
dnu commands install SecretManager
But, it fails with error
unable to locate the package secretmanager
They changed the name of the package which is now "Microsoft.Framework.SecretManager". But this alone did not fix the issue for me. I had to specify the source feed.
dnu commands install Microsoft.Framework.SecretManager 1.0.0-beta7 -s https://www.nuget.org/api/v2/
Hope this helps
I'll write some stuff about asp.net 5.0 which is now cross platform and quite awesome. Keep posted !