:headset: Add propeller aircraft engine noise

README.md

@@ -10,4 +10,10 @@ A 3D game where you drive vehicles to get chocolate.
 
 ### Sound effects
 
+#### Crash sound
+
 From [SuperTuxKart](https://supertuxkart.net/Media_Repo)
+
+#### Propeller driven aircraft engine sound
+
+From [Daveshu88](https://freesound.org/s/325844/) licensed under Creative Commons 0