added sounds and music to menu/splash screen

Music/Interface/main-menu.mp3.import

@@ -0,0 +1,15 @@
+[remap]
+
+importer="mp3"
+type="AudioStreamMP3"
+path="res://.import/main-menu.mp3-aab7bca33746995bd827b1be5c058ba3.mp3str"
+
+[deps]
+
+source_file="res://Music/Interface/main-menu.mp3"
+dest_files=[ "res://.import/main-menu.mp3-aab7bca33746995bd827b1be5c058ba3.mp3str" ]
+
+[params]
+
+loop=true
+loop_offset=0

Music/Interface/splash.wav.import

@@ -0,0 +1,21 @@
+[remap]
+
+importer="wav"
+type="AudioStreamSample"
+path="res://.import/splash.wav-56b87e9c12b1da11cd6e9b9b251c6bbe.sample"
+
+[deps]
+
+source_file="res://Music/Interface/splash.wav"
+dest_files=[ "res://.import/splash.wav-56b87e9c12b1da11cd6e9b9b251c6bbe.sample" ]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop=false
+compress/mode=0