adding docs badge to github readme

README.md

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 [![Join the chat at https://gitter.im/tiernano/b2uploader](https://badges.gitter.im/tiernano/b2uploader.svg)](https://gitter.im/tiernano/b2uploader?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 [![Build Status](https://travis-ci.org/tiernano/b2uploader.svg?branch=master)](https://travis-ci.org/tiernano/b2uploader)
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+[![Documentation Status](https://readthedocs.org/projects/b2uploader/badge/?version=latest)](http://b2uploader.readthedocs.io/en/latest/?badge=latest)
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 ## What is it?
 
 B2Uploader is a Console app (tested on Windows, may work with Mono or .NET Core on Linux and Mac... need to do some testing) which allows you to upload a folder to [Backblaze B2](https://www.backblaze.com/b2/cloud-storage.html).