How to use template email

Added code for show how to use template in the email

Author: ccasbre27

README.md

@@ -109,7 +109,7 @@ using (var attachmentFileStream = new FileStream(@"C:\file.txt", FileMode.Open))
 }
 ```
 
-#How to: Use filters to enable footers, tracking, and analytics
+#How to: Use filters to enable footers, tracking, analytics and templates
 
 SendGrid provides additional email functionality through the use of filters. These are settings that can be added to an email message to enable specific functionality such as click tracking, Google analytics, subscription tracking, and so on. For a full list of filters, see [Filter Settings](https://sendgrid.com/docs/API_Reference/SMTP_API/apps.html).
 
@@ -145,6 +145,19 @@ myMessage.Text = "Hello World!";
 myMessage.EnableClickTracking(true);
 ```
 
+##Template
+```csharp
+// Create the email object first, then add the properties.
+SendGridMessage myMessage = new SendGridMessage();
+myMessage.AddTo("[email protected]");
+myMessage.From = new MailAddress("[email protected]", "John Smith");
+myMessage.Subject = "Testing the SendGrid Library";
+myMessage.Text = "Hello World!";
+
+// Enable template engine, you must send the template id
+ myMessage.EnableTemplateEngine("template id");
+```
+
 #How to: Use the [Web API v3](https://sendgrid.com/docs/API_Reference/Web_API_v3/index.html)
 
 Note: We have just begun to implement support for these endpoints and therefore only the following endpoints are currently supported. This functionality is located in the "SendGrid" project.