How can I add my zip solution to the article?

It's pretty easy.
Drag your zip file to the box on the right hand side where it says "Drag And Drop Files Here". Drop it.
Once the file has uploaded, it will appear above the box in a check box list. (There may be two copies, one with EXE files, and one without).
Ensure the checkboxes are ticked, and click where is says "Add selected zip files to article" - that will add the actual files downloads to the document so readers can see them.

Done!