Large update for version 2.0

config/cart.php

@@ -0,0 +1,16 @@
+<?php
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Default tax rate
+    |--------------------------------------------------------------------------
+    |
+    | This default tax rate will be used when you make a class implement the
+    | Taxable interface and use the HasTax trait.
+    |
+    */
+    'tax' => 21
+
+];