Add remaining sections

Author: tulikavijay

examples/helpers/README.md

@@ -35,3 +35,35 @@ After creating a dictionary, you can go ahead and create a `Personalization` obj
     for to_addr in personalization['to_list']:
        mock_personalization.add_to(to_addr)
 ```
+
+### Creating Attachments
+
+To create attachments, we use the `Attachment` class and make sure the content is base64 encoded before passing it into attachment.content.
+```
+    attachment = Attachment()
+    attachment.content = ("TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQsIGNvbnNl"
+                          "Y3RldHVyIGFkaXBpc2NpbmcgZWxpdC4gQ3JhcyBwdW12")
+```
+Another example: [Link](https://github.com/sendgrid/sendgrid-python/blob/master/use_cases/attachment.md)
+
+### Managing Settings
+
+To configure settings in mail, you can use the `MailSettings` class. The class takes some [parameters](https://github.com/sendgrid/sendgrid-python/blob/master/sendgrid/helpers/mail/mail_settings.py#L1)(such as bcc_settings, bypass_list_management, footer_settings, sandbox_mode)
+
+To add tracking settings, you can add `TrackingSettings` class. See example [here](https://github.com/sendgrid/sendgrid-python/blob/master/examples/helpers/mail_example.py#L118) and parameters and usage [here](https://github.com/sendgrid/sendgrid-python/blob/master/sendgrid/helpers/mail/tracking_settings.py).
+
+### Sending email
+
+After you have configured every component and added your own functions, you can send emails.
+```
+    sg = SendGridAPIClient()
+    data = build_kitchen_sink()
+    response = sg.client.mail.send.post(request_body=data)
+```
+Make sure you have [environment variable](https://github.com/sendgrid/sendgrid-python/blob/master/TROUBLESHOOTING.md#environment-variables-and-your-sendgrid-api-key) set up!
+Full example [here](https://github.com/sendgrid/sendgrid-python/blob/0b683169b08d3a7c204107cd333be33053297e74/examples/helpers/mail_example.py#L203).
+
+### Using Dynamic Templates
+You can use dynamic (handlebars) transactional templates to make things easy and less time taking. To make this work, you should have dynamic template created within your SendGrid account.
+
+See Full example [here](https://github.com/sendgrid/sendgrid-python/blob/0b683169b08d3a7c204107cd333be33053297e74/examples/helpers/mail_example.py#L221).