Include a build in releases or build instructions

[pkmnct]

Hello!

This looks like an ideal program for archiving some of my old MFM DOS machines. I do not see a build of the DOS program anywhere and am not sure how to build it, however.

[tschak909]

It can be built with open-watcom: https://github.com/open-watcom/open-watcom-v2#open-watcom-v2-fork

[desaster]

#6 Added a makefile for the dos program, which should make it easier to build.

OpenWatcom needs to be installed, and the environment properly set with owsetenv.sh