feat(plugins): Adds Twilio SMS plugin

packages/medusa-plugin-twilio-sms/README.md

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+# medusa-plugin-sendgrid
+
+Twilio SMS / Messaging plugin.
+
+## Plugin Options
+
+```
+{
+  account_sid: [twilio messaging account sid] (required),
+  auth_token: [twilio massaging authentication token] (required),
+  from_number: [the number used as sender SMS],
+}
+```
+
+## Dynamic usage
+
+You can resolve the Twilio SMS service to dynamically send SMS's via Twilio.
+
+Example:
+
+```js
+const twilioSmsService = scope.resolve("twilioSmsService")
+twilioSmsService.sendSms({ to: "+4500112233", body: "Hello world!" })
+```