Add new step, second one: payment method

Add payment method form

- select the right form depending on the path

app/webpacker/controllers/paymentmethod_controller.js

@@ -0,0 +1,9 @@
+import { Controller } from "stimulus";
+export default class extends Controller {
+  static targets = ["panel"];
+
+  selectPaymentMethod(event) {
+    this.panelTarget.innerHTML = `<span>${event.target.dataset.paymentmethodDescription}</span>`;
+    this.panelTarget.style.display = "block";
+  }
+}