New port: lang/mlkit

From: Serpent <serpent7776_at_gmail.com>
Date: Sat, 25 Mar 2023 20:42:53 UTC
Hi,

I've added a new port for mlkit, a Standard ML compiler. Can anyone take a
look at it?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269566

Thanks.