add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# md5 from https://pypi.python.org/pypi/argh/json, sha256 locally computed
md5    edda25f3f0164a963dd89c0e3c619973  argh-0.26.2.tar.gz
sha256    e9535b8c84dc9571a48999094fda7f33e63c3f1b74f3e5f3ac0105a58405bb65  argh-0.26.2.tar.gz