Update readme.md

added plugins section in example to use attributes from config.theme

Author: christhofer

README.md

@@ -88,6 +88,9 @@ module.exports = {
       },
     })
   },
+  plugins: [
+    require('@gradin/tailwindcss-scrollbar'),
+  ],
 }
 ```
 
@@ -116,4 +119,4 @@ This plugin uses `::-webkit-scrollbar` to modify scrollbar style.
 
 Not supported in all versions of Firefox and Edge prior version <79.
 
-[See Browser Compatibility](https://caniuse.com/?search=%3A%3A-webkit-scrollbar)
+[See Browser Compatibility](https://caniuse.com/?search=%3A%3A-webkit-scrollbar)