Add sample code to readme

Author: JamesDale

README.md

@@ -14,20 +14,89 @@ It's easy to get started. Simply enter the API Key and secret you obtained from
 
 ### 🚀 Create a webhook
 ```php
+<?php
+require_once('vendor/autoload.php');
+
+$basicAuthUserName = 'YOUR_API_KEY'; // The username to use with basic authentication
+$basicAuthPassword = 'YOUR_SECRET_KEY'; // The password to use with basic authentication
+
+$client = new MessageMediaWebhooksLib\MessageMediaWebhooksClient($basicAuthUserName, $basicAuthPassword);
+
+$webhooks = $client->getWebhooks();
+
+$body = new MessageMediaWebhooksLib\Models\CreateWebhookRequest();
+$body->url = "http://webhook.com/asdasd";
+$body->method = "POST";
+$body->encoding = "JSON";
+$body->headers = array("x-your-webhook-custom-header" => "custom-value");
+$body->events = array("RECEIVED_SMS");
+$body->template = '{"id":"$mtId","status":"$statusCode"}';
+
+$result = $webhooks->createWebhook($body);
 ```
 
 ### 📥 Retrieve all webhooks
 ```php
+<?php
+require_once('vendor/autoload.php');
+
+$basicAuthUserName = 'YOUR_API_KEY'; // The username to use with basic authentication
+$basicAuthPassword = 'YOUR_SECRET_KEY'; // The password to use with basic authentication
+
+$client = new MessageMediaWebhooksLib\MessageMediaWebhooksClient($basicAuthUserName, $basicAuthPassword);
+
+$webhooks = $client->getWebhooks();
+
+$page  =  0;
+$pageSize  =  10;
+
+$result  =  $webhooks->retrieveWebhook($page, $pageSize);
+print_r($result);
 ```
 
 ### 🔄 Update a webhook
 You can get a webhook ID by looking at the `id` of each webhook created from the response of the above example.
 ```php
+<?php
+require_once('vendor/autoload.php');
+
+$basicAuthUserName = 'YOUR_API_KEY'; // The username to use with basic authentication
+$basicAuthPassword = 'YOUR_SECRET_KEY'; // The password to use with basic authentication
+
+$client = new MessageMediaWebhooksLib\MessageMediaWebhooksClient($basicAuthUserName, $basicAuthPassword);
+
+$webhooks = $client->getWebhooks();
+
+$webhookId = "YOUR_WEBHOOK_ID";
+
+$body = new MessageMediaWebhooksLib\Models\CreateWebhookRequest();
+$body->url = "http://webhook.com/some_new_url";
+$body->method = "POST";
+$body->encoding = "JSON";
+$body->headers = array("Account" => "teasdasdst");
+$body->events = array("RECEIVED_SMS");
+$body->template = '{"id":"$mtId","status":"$statusCode"}';
+
+
+$result = $webhooks->updateWebhook($webhookId, $body);
 ```
 
 ### ❌ Delete a webhook
 You can get a webhook ID by looking at the `id` of each webhook created from the response of the retrieve webhooks example.
 ```php
+<?php
+require_once('vendor/autoload.php');
+
+$basicAuthUserName = 'YOUR_API_KEY'; // The username to use with basic authentication
+$basicAuthPassword = 'YOUR_SECRET_KEY'; // The password to use with basic authentication
+
+$client = new MessageMediaWebhooksLib\MessageMediaWebhooksClient($basicAuthUserName, $basicAuthPassword);
+
+$webhooks = $client->getWebhooks();
+
+$webhookId = "YOUR_WEBHOOK_ID";
+
+$webhooks->deleteWebhook($webhookId);
 ```
 
 ## 📕 Documentation