Just leave this also here if someone is Interested:
You can find the latest nightly RetroArch Build
here
If you want to show up your Roms properly, then you need to create a Playlist.
Make sure that your Folder Structure looks similiar to this:
Roms
|_GB
|_GBA
|_SNES
|_etc.
Copy your Roms to the corresponding Folder.
Open
this Site in your Internet Browser .
Now for example, go into your GB Folder and press CTRL + a, drag and drop all the Roms into
your Internet Browser.
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Repeat this Process with every Rom Folder.
Copy your Playlist.lpl Files to the retroarch\playlists Folder.
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If you also want the Thumbnails to show up, then you need to name your Playlists like their corresponding Folders are named in the retroarch\thumbnails Folder. (If there's no Thumbnails Folder or no Thumbnails inside, then open RetroArch --> Online Updater --> Thumbnails Updater --> your desired System(s).) (You can also download the PC Version for this Step...)
Now Open RetroArch and check your Playlists for Missing Icons. Write down all the Games that have no Icons. Go into your Rom Folder and copy the Title of the Game and head over to the ex. retroarch\thumbnails\Nintendo - Game Boy\Named_Boxarts Folder and look for your Game.
Rename the GameIcon.png so that it matches your Game Title. (If there's no Icon, then you can download any Picture and rename it to your Game Title just make sure its .png you can also resize it).
If for some Reason the Icon still wont show up make sure there's no & in the name. If there's an & replace it with an _ .
BTW this Tutorial should also work on other Plattforms than the Switch.
