bin: introduce `moshscreen` helper connecting and attaching tmux or screen

Signed-off-by: Alejandro Mery <amery@geeks.cl>

files/bin/moshscreen

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+set -eu
+
+if [ $# -eq 1 ]; then
+       exec mosh "$1" ~/bin/tmux-reattach
+else
+       exec mosh "$@"
+fi