Added FAQ

FAQ.md

@@ -297,6 +297,7 @@ Fonts, sizes, colors, etc should be material design whenever possible.
 * [(163) What is message classification?](#user-content-faq163)
 * [(164) Can you add customizable themes?](#user-content-faq164)
 * [(165) Is Android Auto supported?](#user-content-faq165)
+* [(166) Can you add snooze to folder?](#user-content-faq166)
 
 [I have another question.](#user-content-support)
 
@@ -3634,6 +3635,21 @@ The developers guide is [here](https://developer.android.com/training/cars/messa
 
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+<a name="faq166"></a>
+**(166) Can you add snooze to folder?**
+
+First of all, there is no standard for snoozing messages, so all snooze implementations are custom solutions.
+
+Snoozing to a folder requires the message to be moved to another folder (obviously).
+Moving a message can fail and moving a message back on waking up can fail too.
+Moreover, snoozing can be done only after the message has been moved,
+which would be problematic when there is no internet connection available.
+
+To prevent these issues, snoozing is done locally on the device by hiding the message while it is snoozing.
+Unfortunately, it is not possible to hide messages on the email server.
+
+<br />
+
 ## Get support
 
 FairEmail is supported on smartphones, tablets and ChromeOS only.