Added instructions to use distributed files

Author: Miklos Szanyi

README.md

@@ -2,12 +2,21 @@
 Responsive grid classes for Bootstrap 4. Extends Bootstrap 4 with display: grid utilities.
 Uses Bootstrap 4 variables and mixins. It will pick up Bootstrap's or your override varaibles such as $grid-breakpoints. To generate responsive grid utilities.
 
-## install
+## Install
 
 ``` bash
 npm i grid-bootstrap
 ```
 
+## Use ready css
+
+Link our distributed script in your html's head:
+
+```html
+<link rel="stylesheet" type="text/css" href="//unpkg.com/grid-bootstrap"></script>
+<!-- `grid-bootstrap` is now available on the page -->
+```
+
 ## How to use
 
 ### For compiling