Update README.md

Author: linvi

README.md

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-# tweetinvi
+# Tweetinvi
+
 Tweetinvi is an intuitive .NET C# library to access the Twitter REST API. It is a Portable Class Library that can be used for development on Windows, Windows RT, Windows Phone, Mono, Xamarin Android and Xamarin iOS. Tweetinvi is also compatible for Universal App development.
+
+[Please click here to read the Wiki](https://github.com/linvi/tweetinvi/wiki)