How does contributing work in here?

[ngdangtu-vn]

I would like to add a few more special folders but I wonder is it ok to do and how should I do it.

Here is the list of icons I plan to work on:

1. folder-archive
2. folder-workplace
3. folder-book
4. folder-blender
5. folder-godot

A fix some exist folders that are messed up with symbolic:

1. folder-game
2. folder-gitlab
3. folder-git
4. folder-steam
5. folder-script
6. folder-torrent
7. folder-html

Can I have instruction for contributing?