add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# md5 from https://pypi.python.org/pypi/xlrd/json
md5    9a91b688cd4945477ac28187a54f9a3b  xlrd-1.0.0.tar.gz
# sha256 calculated by scanpypi
sha256    0ff87dd5d50425084f7219cb6f86bb3eb5aa29063f53d50bf270ed007e941069  xlrd-1.0.0.tar.gz