markdownlint: add local copy of config

Having the global config (from openbmc-build-scripts) locally makes
it easier for developers to run the tools and get the same results.

Signed-off-by: Patrick

markdownlint: add local copy of config

Having the global config (from openbmc-build-scripts) locally makes
it easier for developers to run the tools and get the same results.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I2c41f3f10bf46303ef75c2ea877017631f478643

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