add acacia trees

grows in the desert near the edges of the biome

biome_defs.lua

@@ -90,6 +90,18 @@ moretrees.willow_biome = {
 	max_count = 5,
 }
 
+moretrees.acacia_biome = {
+	surface = { "default:dirt_with_grass", "default:desert_sand" },
+	avoid_nodes = moretrees.avoidnodes,
+	avoid_radius = 15,
+	seed_diff = 1,
+	rarity = 50,
+	max_count = 15,
+	plantlife_limit = -1,
+	humidity_min = 0.3,
+	humidity_max = 0,
+}
+
 moretrees.rubber_tree_biome = {
 	surface = "default:dirt_with_grass",
 	avoid_nodes = moretrees.avoidnodes,
@@ -168,3 +180,4 @@ moretrees.fir_biome_snow = {
 	delete_above = true,
 	spawn_replace_node = true
 }
+