Just in case, do note that adding a folder won't trigger anything for Git: you won't be able to push it if that folder is empty, because Git will consider it as "no content", and will ignore that new folder.
See also "How do I add an empty directory to a git repository?".
If you add a folder and some files in it, then the GitHub for Windows interface will detect that new content, and ask you to add and commit, which means you will be able to push.