[ADD] sale completion

src/App.vue

@@ -1,6 +1,6 @@
 <template lang="pug">
     .pos
-        form-wizard(title='' subtitle='' finishButtonText='Finalizar' color='#7c7bad' nextButtonText='Continuar' backButtonText='Volver')
+        form-wizard(title='' subtitle='' finishButtonText='Finalizar' color='#7c7bad' nextButtonText='Continuar' backButtonText='Volver' @on-complete="createSale')
             tab-content(title="Qué productos necesita?" :before-change="checkCart")
                 product-step
             tab-content(title="Quién es el cliente?" :before-change="checkCustomer")