[zsh] Update shell init: profile

zsh/func/list_tmux_sessions

@@ -0,0 +1,16 @@
+#!/usr/bin/env zsh
+# Eryn Wells <eryn@erynwells.me>
+
+function list_tmux_session
+{
+    local tmux_out=`tmux list-sessions 2>/dev/null`
+    [[ -z "$tmux_out" || -n "$TMUX" ]] && return
+
+    echo "You have the following active tmux sessions:"
+    for session in ${(f)tmux_out}; do
+        echo "    $session"
+    done
+    echo
+}
+
+list_tmux_session "$@"