Closes #4 Document workaround for dockers default  seccomp security profile
Closes #4 Document workaround for dockers default  seccomp security profile

Its reported that if you have seccomp enabled, you get the following error when
running the container:

    setarch: i386: Unrecognized architecture

Since dwarf fortress depends on system calls that are by default blocked by the
default seccomp security profile, my best option at this point is to document
this in the README, since maintaining my own version of a seccomp profile just
is not practical.

bencawkwell/dockerfile-dwarffortress