i'm using Xamarin and now i need to use Octokit.Net - a library for cross-platform. I'm cant find any useful document or example about this library to work on xamarin(mobile) Any one can help please... Thanks.
You should be able to install the package through Xamarin Studio like any other NuGet package.
In terms of docs, here's a good getting started guide, and there are some other docs here which I'm working on whenever I have some spare time.