explain how to install / uninstall

bin/README.md

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+# Host setup
+
+1. add the openkubsd anchor in `/etc/pf.conf`
+2. run `./setup.sh` as root
+
+# Setup information
+
+OpenKuBSD will store everything in `/var/openkubsd/`, and make a few changes in `/etc/`
+
+- overwrite /etc/vm.conf
+- overwrite /etc/dhcpd.conf
+- overwrite /etc/hostname.vether0
+- overwrite /etc/hostname.bridge0
+- rcctl enable vmd dhcpd
+- add `net.inet.ip.forwarding=1` to /etc/sysctl.conf
+- modify `/etc/hosts` at the end of the file, after an automatically added comment `# OpenKuBSD`
+
+If you want to remove OpenKuBSD, undo the changes above.