Update types-of-emails-github-sends.md

- Added research emails to intro & added a section

content/github/setting-up-and-managing-your-github-user-account/types-of-emails-github-sends.md

@@ -1,6 +1,6 @@
 ---
 title: Types of emails GitHub sends
-intro: 'There are several types of emails you can receive from {% data variables.product.product_name %}, including notifications, account information, and marketing communications.'
+intro: 'There are several types of emails you can receive from {% data variables.product.product_name %}, including notifications, account information, customer research invitations, and marketing communications.'
 redirect_from:
   - /articles/types-of-emails-github-sends
 versions:
@@ -25,6 +25,17 @@ You can also choose which type of email updates you'd like to receive on convers
 
 If you've upgraded to paid products or features, then you'll receive billing receipts at the account's primary email address. For more information, see "[Setting your billing email](/articles/setting-your-billing-email)."
 
+### Customer research emails
+
+{% data variables.product.product_name %} occasionally seeks customers to participate in research sessions to help us build a better GitHub. These are conducted remotely, open to customers worldwide, and may include:
+
+- Feedback surveys
+- Research interviews
+- Usability testing sessions
+- Previewing early prototypes or concepts
+
+These emails are infrequent and you can choose whether or not to participate. If you're interested in additional opportunities to participate in research sessions, you may add yourself to the [GitHub Customer Research Panel](https://cxr.github.com).
+
 ### Marketing emails
 
 {% data variables.product.product_name %} occasionally sends these types of marketing emails: