Added FAQ

FAQ.md

@@ -233,6 +233,7 @@ FairEmail follows all the best practices for an email client as decribed in [thi
 * [(131) Can you change the direction for swiping to previous/next message?](#user-content-faq131)
 * [(132) Why are new message notifications silent?](#user-content-faq132)
 * [(133) Why is ActiveSync not supported?](#user-content-faq133)
+* [(134) Can you add deleting local messages?](#user-content-faq134)
 
 [I have another question.](#user-content-support)
 
@@ -2255,6 +2256,16 @@ For this reason you won't find many, if any, other email clients supporting Acti
 
 <br />
 
+<a name="faq134"></a>
+**(134) Can you add deleting local messages?**
+
+Since locally deleted messages would be downloaded again on the next sync it is not possible to permanently delete local messages.
+
+As an alternative you can snooze messages, which will hide messages for a selected time.
+
+<br />
+
+
 ## 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).