add .BoardConfig.mk package-file

hc

2023-05-31 43fd8d44e8182b691c8ee61d487cec02ca11afd2

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# Locally computed
sha256 5f42858a2062f34d2578e9cb1aed3ccb8d2409d908aa4c41a924418666d5f2bd  let-me-create-v1.5.2.tar.gz