Add music credits

Projekte/mdga/client/src/main/resources/music/CREDIT.txt

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+# Credit
+
+## Free SynthWave Music Pack
+
+See "Free SynthWave Music Pack License.pdf" for LICENCE information.
+
+ - 80s,Dico,Live.wav
+ - LaserParty.wav
+ - NeonRoadTrip.wav
+ - NoPressureTrance.wav
+ - RetroNoir.wav
+ - SpaceInvaders.wav
+ - TheSynthRave.SynthWave
+
+## Short Loopable Background Music
+
+ https://joshuuu.itch.io/short-loopable-background-music
+
+ Free for personal or commercial use as long as you don't redistribute as your own. Donations also welcome! Please add jhaeka to your credits. :)
+
+ - DeadPlanet.wav
+ - Spaceship.wav