Add OpenBSD installation instructions
Add OpenBSD installation instructions

asciinema/asciinema.org,asciinema/asciinema.org,asciinema/asciinema.org,asciinema/asciinema-server,asciinema/asciinema.org,asciinema/asciinema-server,asciinema/asciinema-server,asciinema/asciinema-server