Update readme

Author: sangnguyenplus

public/images/screenshot.png

@@ -7,6 +7,11 @@ Purchase it here: [https://codecanyon.net/item/botble-cms-php-platform-based-on-
 - Run command `php artisan cms:plugin:activate log-viewer` to activate this plugin.
 - Go to Admin -> Platform Administration -> System logs.
 
+
+# Screenshots
+
+![Single log](https://raw.githubusercontent.com/botble/log-viewer/master/public/images/screenshot.png)
+
 # Credits
 This plugin is using source code from https://github.com/ARCANEDEV/LogViewer by [ARCANEDEV©](http://www.arcanedev.net)