Add comments about tmux
Add comments about tmux

Fixes #16

Signed-off-by: Andrew Naylor <beb203a09b91ee6d5f17f7952d909dd19d3a8ba7@mkbot.net>

argon/mas,mas-cli/mas,mas-cli/mas,argon/mas,mas-cli/mas,mas-cli/mas,argon/mas,argon/mas,argon/mas