Initial sound code.

main.lua

@@ -1,4 +1,5 @@
 function _init()
+   init_sound()
    init_mapgen()
    init_player({block_size/2, block_size/2})
    generate_map({0, 0})

sfx_map.md

@@ -0,0 +1,12 @@
+### sfx
+---
+0 - noise effect for wind track (sfx 9)
+1 - little bell
+
+8 - desert music 1
+9 - desert wind
+10 - desert music 2
+
+### patterns
+---
+0-1 - desert bgm (loops on 1)

sound.lua

@@ -0,0 +1,8 @@
+-- Defines constants and plays music and sound effects
+
+function init_sound()
+   -- each name maps to a pattern number to play
+   music_map = {
+      desert = 0,
+   }
+end