Add outlook-notify.sh

A script I use at work that shows me how many new messages there are in
my offlineimap-synced version of my Outlook 365 inbox. Far from perfect,
but currently does the job. It counts the files in the maildir and sends
out a (dunst) notification.
Add basic offlineimap configuration

No accounts yet. And I doubt I'll list them on GitHub.
Add the first stub of my .XCompose
Add my dunstrc

Which I shamelessly stole from Debian.
Add my htoprc

htop generated it for me. That's nice of htop, isn't it?
More .gitignores \o/