docs: added information on the icons color overwriting possibility (#…

…3458)

packages/foundations/docs/Icons.md

@@ -3,6 +3,7 @@
 -   We use icon fonts as **woff2** files for all our icons.
 -   We auto generate these files out of `.svg` files.
 -   A lot of our [components](../../components/readme) have an `icon` property you can pass in.
+-   Use the CSS Custom Property `--db-icon-color` to overwrite the icons color.
 
 ## How to include icons
 
@@ -19,6 +20,10 @@ You can add an icon before or after a tag, by adding an `data-` attribute to you
 | `before` |    `data-icon="icon-from-overview"`    |
 | `after`  | `data-icon-after="icon-from-overview"` |
 
+### Icons color
+
+You could use the CSS Custom Property `--db-icon-color` to overwrite the icons color, be it icon fonts or when using the SVG files directly. Or `--db-icon-pulse-color` for the illustrative icons pulse color.
+
 ## Custom Icons
 
 If you have custom icons and want to use them for foundations and/or in components, you need to generate a **woff2** file.