docs: create parent dirs in README.md #513

Job	Run time
build-stable / Get Stream Info	13s
build-stable / Get Workflow Info	1s
build-stable / fedora-coreos (-nvidia, -zfs)	34s
build-stable / fedora-coreos (-nvidia)	33s
build-stable / fedora-coreos (-zfs)	37s
build-stable / ucore (-minimal, -nvidia, -zfs)	33s
build-stable / ucore (-minimal, -nvidia)	37s
build-stable / ucore (-minimal, -zfs)	38s
build-stable / ucore (-minimal)	37s
build-stable / ucore (-nvidia, -zfs)	32s
build-stable / ucore (-nvidia)	36s
build-stable / ucore (-zfs)	37s
build-stable / ucore	37s
build-stable / ucore (-hci, -nvidia, -zfs)	32s
build-stable / ucore (-hci, -nvidia)	38s
build-stable / ucore (-hci, -zfs)	32s
build-stable / ucore (-hci)	37s
build-stable / Check all successful	1s
	9m 5s

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