I want to implement a new category like category-manager out-of-the-box,how could i do.
1. only administrator can maintain a new category in admin-console or otherwhere
2. when upload file i can set the category to the file like <aspect name="cm:generalclassifiable">
3. it's very difficult to me implement front-end tree view module, i can't google some example, a github address is best
please give me some advices,thanks