Add udev rules for devices

Hey, I tried to use this flatpak and never detect my `Spyder X`, then after a research I found that we need to create an udev rule that allow access to the specific devices.

My question is, Is it good if we add to this repo a directory where we can put all this udev rules and a simple explanation in a readme in the same directory to explain how to install in the OS? (I can create a PR with this and the simple rule that I create for the `Spyder X` as example)