Need the masters' help with app publishing!

Hello masters of programming out there, I've recently just made myself a little ebook app for the android and it is ready to be published to Google Play. However, I have a problem with the formatting. I only have a folder with all the contents of the app in it, some of the files in it include app.xml, pictures (jpg files), html files for different pages, and icons (png). Look at the screenshot below:


How do I upload these contents as an app to Google Play? Or do I have to convert all of them to a specific file? If so which application should I use? I tried Android SDK already, didn't work. Thanks all!