Create customers controller

And add new customers routes.

Disable them in production for now.

app/controllers/api/v1/customers_controller.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    class CustomersController < Api::V1::BaseController
+      def index; end
+
+      def show; end
+
+      def update; end
+
+      def destroy; end
+    end
+  end
+end