Added model admin icon example

README.md

@@ -1,16 +1,22 @@
 # Flat Admin for SilverStripe
-####Custom CSS for the SilverStripe 3.2 CMS Admin Interface.
+####Custom CSS for the SilverStripe CMS Admin Interface.
 
 This module basic overrides some basic CSS that is found in the SilverStripe framework.
 
 ###Installation:
 ####Composer:
-```
+```json
 require: "mediabeast/flat-admin": "3.2"
 ```
-###Download:
+####Download:
 Clone or download this repo, copy it into your website folder, rename the folder to `flat-admin` and then run `dev/build`.
 
+### Configuration
+If you have ModelAdmins with no icons then you'll want to replace the black SilverStripe icon as it's very hard to see with this theme installed. For a quick alternative use one of the icons located in the flat admin theme e.g.
+```php
+private static $menu_icon = 'flat-admin/images/db.png';
+```
+
 ### Contribution
 I'm a developer so I'd be keen for an actual designer to suggest some changes. I only want to change CSS and not the structure of the HTML as I think that will cause issues if SilverStripe update a template at their end and someone has this module installed. So I anyone has any suggestions on colors etc feel free to let me know of do a pull request.