This would get more use if it were in the WordPress plugin directory.

Also, it would be a good idea to edit this post and mention you've got to unzip the file and upload the zip file inside. Giving step-by-step instructions on how to upload a plugin would be good, since some people only know how to add plugins via the WordPress search feature. (You'd be amazed how confusing uploading a file to WordPress is for some people.)

Lastly, put up a screenshot where GitHub's download file button is...that thing is so easily missed.