Add Documentation /README files) for dovecot.

DOC/dovecot/README.dovecot.systemd

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+
+
+Debian Jessie comes with systemd so you really should not use initscript anymore but 
+switch to systemd for starting dovecot. There is systemd service description file available 
+for you in case your vendor does not provide it in the package:
+
+https://github.com/dovecot/core/blob/master/dovecot.service.in
+
+--
+
+> i use ./configure with
+> --with-systemdsystemunitdir=/etc/systemd/system/ and that installs the
+> systemd.service and socket
+
+That's what I missed, thank you a lot. And service seems to handle
+correctly restarts 
+
+Also use:
+   --with-rundir=/var/run/dovecot
+
+--