Include MakePri in Packaging documentation

[bdbai]

In a UWP package layout generated by Visual Studio, there is a resources.pri file that includes all static assets. Is it necessary to mention the procedure to produce it in Packaging.md?

[tim-weis]

Thanks for the feedback, @bdbai! Undoubtedly, you have come to realize, that much of this repository is based on your excellent work. It served both as a launchpad, as well as the go-to resource to look things up, whenever I got stuck. Thanks for sharing the results of your research. This has been truly invaluable.

While I do plan to increase the feature reach of cargo uwp to close in on what the UWP offers, I'd like to keep things as simple as possible for the time being. Resource handling and management is a huge topic, that requires a base level of localization support to be useful.

At this time, there aren't any artifacts that MakePri.exe could use. I'll make sure to update the documentation once that has changed.