Update README.md

Added an installation section as suggested in Issue #7

README.md

@@ -36,6 +36,19 @@ Feel free to contribute and make sure to check [Dark-WhatsApp style by vednoc](h
 
 See the [Changelog](Changelog.md) for more details.
 
+## Installation
+
+To use this style you'll need to install
+[Stylus](https://add0n.com/stylus.html)
+first, and then click on the button below.
+
+<a target="_blank" rel="noopener noreferrer" href="https://raw.githubusercontent.com/Barina/Dark-Telegram/master/Dark-Telegram.user.styl">
+  <img src="https://img.shields.io/badge/Install%20directly%20with-Stylus-116b59.svg?longCache=true&style=flat"/>
+</a>
+<br />
+
+For more information, please follow the original style [Dark-WhatsApp installation section](https://github.com/vednoc/dark-whatsapp/wiki/Installation).
+
 ## Credits
 
 Full credit for design goes to original style creators at [vednoc](https://github.com/vednoc).