Hello,
The libraries page currently has a bug preventing clicking the submission button for new APIs that support the REST API v1.1.
TweetSharp has been upgraded to support v1.1 and there is a public preview available on NuGet.
Details below: TweetSharp (by @danielcrenna) https://github.com/danielcrenna/tweetsharp
Thanks, I’ll look into the saving issue and get this added to the list soon.