The UWP Tile Generator gives you the ability to generate the tiles required to submit a UWP to the Universal Store. A simple right-click on an image in your project and this VSIX takes care of the rest. As well as generating the images it also updates the package manifest.
Rather than write a lengthy blog post, have a look at one I wrote earlier:
To download the extension please go here:
and if you would like to contribute and add more features to the UWP Tile Generator then don't be shy! Head over to:
and create a pull request.
Hope this helps you in your UWP apps.