Adding tmux 'init' scripts for mail and music

bin/tmux_mail.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+tmux split-window -l 5 check_mail.sh
+tmux select-pane -U
+tmux rename-window ✉
+alot

bin/tmux_music.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+tmux split-window -l 5 mopidy
+tmux select-pane -U
+tmux rename-window ♫
+ncmpcpp