Packaging strategy for Windows

I just added the ability to package the application as an [appImage](https://appimage.org/) file that runs in almost every Linux distro. ( there are one or two things pending to make it better).
MacOS packaging will be added very soon.
If someone can figure out how to make something similar for Windows, is welcome to make a PR.
For reference, take a look to: https://github.com/electron/windows-installer