added FAQ

FAQ.md

@@ -118,6 +118,7 @@ Note that your contacts could unknowingly send malicious messages if they got in
 * [(53) Can you stick the message action bar to the top/bottom?](#user-content-faq53)
 * [(54) How do I use a namespace prefix?](#user-content-faq54)
 * [(55) How can I mark all messages as read / move or delete all messages?](#user-content-faq55)
+* [(56) Can you add support for JMAP?](#user-content-faq56)
 
 [I have another question.](#support)
 
@@ -833,6 +834,14 @@ Long press the first message, don't lift your finger and slide down to the last
 Then use the three dot action button to execute the desired action.
 
 
+<a name="faq56"></a>
+**(56) Can you add support for JMAP?**
+
+There are almost no providers offering the [JMAP](https://jmap.io/) protocol,
+so it is not worth to add support for this to FairEmail.
+
+
+
 ## Support
 
 If you have another question, want to request a feature or report a bug, you can use [this forum](https://forum.xda-developers.com/android/apps-games/source-email-t3824168).