Add treated wood mixing recipe

kubejs/server_scripts/recipes/create/mixing_treated_wood.js

@@ -0,0 +1,6 @@
+// priority: 0
+
+onEvent("recipes", event => {
+  event.recipes.createMixing("immersiveengineering:treated_wood_horizontal",
+    [ "#minecraft:planks", Fluid.of("immersiveengineering:creosote", 125) ]);
+});