fix(medusa-plugin-sendgrid): decorate order placed data for email

packages/medusa-plugin-sendgrid/README.md

@@ -0,0 +1,33 @@
+# medusa-plugin-sendgrid
+
+Sendgrid Plugin for Medusa to send transactional emails.
+
+
+If no values are defined for a given option, the plugin will not try to send an email for that event.
+
+## Plugin Options
+```
+{
+  api_key: [your sendgrid api key] (required),
+  from: [the from field, i.e. ACME <acme@mail.com>] (required),
+  gift_card_created_template: [used on gift_card.created],
+  order_placed_template: [used on order.placed],
+  order_cancelled_template: [used on order.cancelled],
+  order_completed_template: [used on order.completed],
+  user_password_reset_template: [used on user.password_reset],
+  customer_password_reset_template: [used on customer.password_reset]
+}
+```
+
+## Dynamic usage
+
+You can resolve the SendGrid service to dynamically send emails via sendgrid.
+
+Example:
+
+```js
+
+const sendgridService = scope.resolve("sendgridService")
+sendgridService.sendEmail("d-123....", "ACME <acme@mail.com>", "customer@mail.com", { dynamic: "data" })
+
+```