Added a jump sound effect

I also added all of the files for berry sound effects but those arent
implemented yet.

Audio/SFX/Downgrade.mp3.import

@@ -0,0 +1,19 @@
+[remap]
+
+importer="mp3"
+type="AudioStreamMP3"
+uid="uid://i8mc8681j6p1"
+path="res://.godot/imported/Downgrade.mp3-70d446425f2d77cd355d2a77e60e892d.mp3str"
+
+[deps]
+
+source_file="res://Audio/SFX/Downgrade.mp3"
+dest_files=["res://.godot/imported/Downgrade.mp3-70d446425f2d77cd355d2a77e60e892d.mp3str"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4