docs: add some info about freebsd

docs/freebsd.md

@@ -0,0 +1,39 @@
+# FreeBSD
+
+To setup a VM follow the [qemu instructions](https://wiki.qemu.org/Hosts/BSD).
+Start a VM with:
+```
+qemu-system-x86_64 -m 2048 -hda FreeBSD-11.0-RELEASE-amd64.qcow2 -enable-kvm -netdev user,id=mynet0,host=10.0.2.10,hostfwd=tcp::10022-:22 -device e1000,netdev=mynet0 -nographic
+```
+(for me it required building a fresh qemu-system-x86_64)
+
+After booting add the following to `/boot/loader.conf`:
+```
+autoboot_delay="-1"
+console="comconsole"
+```
+
+and the following to `/etc/rc.conf`:
+```
+sshd_enable="YES"
+ifconfig_em0="inet 10.0.0.1 netmask 255.255.255.0"
+```
+
+setup sshd in `/etc/ssh/sshd_config` along the lines of:
+```
+Port 22
+AddressFamily any
+ListenAddress 0.0.0.0
+ListenAddress ::
+Protocol 2
+HostKey /etc/ssh/ssh_host_rsa_key
+SyslogFacility AUTH
+LogLevel INFO
+AuthenticationMethods publickey password
+PermitRootLogin yes
+PubkeyAuthentication yes
+AuthorizedKeysFile .ssh/authorized_keys .ssh/authorized_keys2
+PasswordAuthentication yes
+PermitEmptyPasswords yes
+Subsystem sftp /usr/libexec/sftp-server
+```