chore: added messaging bulk example (#243)

* chore: added messaging bulk example

* chore: added messaging bulk example

* chore: added messaging bulk example

* chore: corrected message

README.md

@@ -10,7 +10,7 @@ and [twilio-oai](https://github.com/twilio/twilio-oai). If you find an issue wit
 please go ahead and open an issue or a PR against the relevant repositories.
 
 ## 🚀 Feature Update
-Twilio Go Helper Library's version 1.20.0 adds support for the application/json content type in the request body. 
+Twilio Go Helper Library's version 1.20.0 adds support for the application/json content type in the request body. See example [here](#messaging-bulk).
 Behind the scenes Go Helper is now auto-generated via OpenAPI with this release.
 This enables us to rapidly add new features and enhance consistency across versions and languages.
 
@@ -301,6 +301,48 @@ func main() {
 }
 ```
 
+### Send Bulk Message <a id="messaging-bulk"></a>
+
+Try sending a message to multiple recipients with JSON request body support.
+
+```go
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/twilio/twilio-go"
+	previewMessaging "github.com/twilio/twilio-go/rest/preview_messaging/v1"
+)
+
+func main() {
+	accountSid := "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+	authToken := "f2xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+
+	client := twilio.NewRestClientWithParams(twilio.ClientParams{
+		Username: accountSid,
+		Password: authToken,
+	})
+
+	// create multiple recipients
+	msg1 := previewMessaging.MessagingV1Message{To: "+XXXXXXXXXX"}
+	msg2 := previewMessaging.MessagingV1Message{To: "+XXXXXXXXXX"}
+
+	// create message request object
+	req := &previewMessaging.CreateMessagesRequest{Messages: []previewMessaging.MessagingV1Message{msg1, msg2}, Body: "Hello from Go!", From: "+XXXXXXXXXX"}
+	params := &previewMessaging.CreateMessagesParams{CreateMessagesRequest: req}
+
+	resp, err := client.PreviewMessagingV1.CreateMessages(params)
+	if err != nil {
+		fmt.Println("Error sending SMS message: " + err.Error())
+	} else {
+		response, _ := json.Marshal(*resp)
+		fmt.Println("Response: " + string(response))
+	}
+}
+```
+
 ### Iterate through records
 
 This library also offers paging functionality. Collections such as calls and messages have `ListXxx` and `StreamXxx`