Added FAQ

FAQ.md

@@ -268,7 +268,8 @@ Fonts, sizes, colors, etc should be material design whenever possible.
 * [(148) How can I use an Apple iCloud account?](#user-content-faq148)
 * [(149) How does the unread message count widget work?](#user-content-faq149)
 * [(150) Can you add cancelling calendar invites?](#user-content-faq150)
-* [(151) Can you add backup/restore messages?](#user-content-faq150)
+* [(151) Can you add backup/restore messages?](#user-content-faq151)
+* [(152) How can I insert a contact group?](#user-content-faq152)
 
 [I have another question.](#user-content-support)
 
@@ -2926,6 +2927,15 @@ If you want to make a backup yourself, you could use a tool like [imapsync](http
 
 <br />
 
+<a name="faq152"></a>
+**(152) How can I insert a contact group?**
+
+You can insert the email addresses of all contacts in a contact group via the three dots menu of the message composer.
+
+You can define contact groups with the Android contacts app, please see [here](https://support.google.com/contacts/answer/30970) for instructions.
+
+<br />
+
 ## Support
 
 Only the latest Play store version and latest GitHub release are supported.