remail: Add TODO and a hacky service file

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

TODO

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+Non-comprehensive todo list:
+
+- Add Python setup.py
+
+- Add Debian/RPM packaging
+
+- Write a proper service file
+
+- Mail command processing (FREEZE/UNFREEZE of subscribers, UNFREEZE of
+  frozen messages). Most of the code is already available, I just need
+  to find the time to clean it up and move it over from the old python2
+  based version which served us well for more than a year.

remail.service

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+[Unit]
+Description=remail server
+After=syslog.target network.target
+ConditionPathExists=/home/remail/remail/remail.yaml
+
+[Service]
+Type=simple
+User=remail
+WorkDir=~/remail
+ExecStart=/usr/bin/remail_daemon -v /home/remail/remail/remail.yaml
+ExecReload=/bin/kill -HUP $MAINPID
+[Install]
+WantedBy=default.target