sh: Add default open script

Simple wrapper for xdg-open functionality. Simply refers
to xdg-open except if there exists mimeo on the system
which it will refer to instead.

So, a simple preference modificator for mimeo over
xdg-open since that is my preference too.

Also gave it a short name so I can do open whenever I
want and don't have to tax my left hand with tying xdg.

sh/.local/bin/open

@@ -0,0 +1,8 @@
+#!/usr/bin/env sh
+# file opener using your preferred applications
+
+if exist mimeo; then
+    mimeo "$1"
+elif exist xdg-open; then
+    xdg-open "$1"
+fi