Create README.md

Author: linvi

README.md

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+# Tweetinvi
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+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.
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+[Please click here to read the Wiki](https://github.com/linvi/tweetinvi/wiki)
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+[Nuget Package](https://www.nuget.org/packages/TweetinviAPI/) : `Install-Package TweetinviAPI`
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+ [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/linvi/tweetinvi?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=body_badge)