rsync -av --include '*.md' --include '*/' --exclude '*' --prune-empty-dirs src/ dst/https://unix.stackexchange.com/questions/741904/rsync-to-exclude-everything-except-specific-files
rsync -av --include '*.md' --include '*/' --exclude '*' --prune-empty-dirs src/ dst/https://unix.stackexchange.com/questions/741904/rsync-to-exclude-everything-except-specific-files