update readme with IMAP settings instructions

test/README.md

@@ -21,6 +21,15 @@ $ HOME=$PWD lldb python3 --  ../sync_handshake.py -e Phone
 Then this side is doing a replay in the debugger.  Using touch to set a
 different timestamp on the marker will only partly replay.
 
+In order to work with IMAP you need to create a sync_settings.py file with the
+following variables:
+
+IMAP_HOST = 'domain.ch'
+IMAP_PORT = '993'
+IMAP_USER = 'your_username'
+IMAP_PWD = 'password'
+IMAP_EMAIL = 'user@domain.ch'
+
 = Hint =
 
 installing termcolor and lxml will beautify the output