Added FAQ

FAQ.md

@@ -235,7 +235,7 @@ FairEmail follows all the best practices for an email client as decribed in [thi
 * [(133) Why is ActiveSync not supported?](#user-content-faq133)
 * [(134) Can you add deleting local messages?](#user-content-faq134)
 * [(135) Why are trashed messages and drafts shown in conversations?](#user-content-faq135)
-* [(136) Why does my Gmail account show 'Invalid credentials'?](#user-content-faq136)
+* [(136) How can I delete an account/identity/folder?](#user-content-faq136)
 
 [I have another question.](#user-content-support)
 
@@ -2300,6 +2300,19 @@ It is easy to read through the received messages before continuing to write the
 
 <br />
 
+<a name="faq136"></a>
+**(136) How can I delete an account/identity/folder?**
+
+Deleting an account/identity/folder is a little bit hidden to prevent accidents.
+
+* Account: Setup > Step 1 > Manage > Tap account
+* Identity: Setup > Step 2 > Manage > Tap identity
+* Folder: Long press the folder in the folder list > Edit properties
+
+In the three-dots overflow menu at the top right there is an item to delete the account/identity/folder.
+
+<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).