add tmux-select command

src/tmux-select

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+_dmenu_config="$HOME/.config/dmenu/dmenurc"
+_sessions="$(tmux ls | cut -d: -f1)"
+
+if [ -f "$_dmenu_config" ] ; then
+  # dmenu options will now be stored in $DMENU_OPTIONS
+  . "$_dmenu_config"
+fi
+
+_session=$(echo "$_sessions" | dmenu $DMENU_OPTIONS -i -p "Tmux session:")
+
+[ -z "$_session" ] || terminal-dev tmux attach -t $_session