doc: add logo to readme

Author: alireza-mh

README.md

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 ## Twitter Batch Mutter Chrome Extension
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+<p align="center"><img  height="150" src="https://raw.githubusercontent.com/alireza-mh/Twitter-Batch-Mutter-Extension/master/img/Twitter_Bird-mutter.svg"/></p>
 This chrome extension helps you to batch mute words on twitter muted keywords page(https://twitter.com/settings/muted_keywords).
 this extension will run without needing your account information. since there wasn't any API for muting words this extension will automatically add your words one by one.