Out of the box you will have an example of tag management (for the cases in which you are developing a blog or a shop). To access this example, click the "Examples/Tags" link in the left sidebar or add /examples/tags/list to the URL. You can add and edit tags here, but you can only delete them if they are not attached to any items.
The store used for role functionality is found in src\store\tag.module.js
You can find the compoments for role functionality in src\views\examples\Tags folder.