Add Desertstone / Desert Cobblestone stairs & slabs

mods/stairs/init.lua

@@ -229,8 +229,22 @@ stairs.register_stair_and_slab("stone", "default:stone",
 stairs.register_stair_and_slab("cobble", "default:cobble",
 		{cracky=3},
 		{"default_cobble.png"},
-		"Cobble Stair",
-		"Cobble Slab",
+		"Cobblestone Stair",
+		"Cobblestone Slab",
+		default.node_sound_stone_defaults())
+
+stairs.register_stair_and_slab("desert_stone", "default:desert_stone",
+		{cracky=3},
+		{"default_desert_stone.png"},
+		"Desertstone Stair",
+		"Desertstone Slab",
+		default.node_sound_stone_defaults())
+
+stairs.register_stair_and_slab("desert_cobble", "default:desert_cobble",
+		{cracky=3},
+		{"default_desert_cobble.png"},
+		"Desert Cobblestone Stair",
+		"Desert Cobblestone Slab",
 		default.node_sound_stone_defaults())
 
 stairs.register_stair_and_slab("brick", "default:brick",