Build

docs: add plans/ directory for design and implementation plans #4400

Job	Run time
muon minimal static	41s
libnvme (debian, gcc, release)	57s
musl libc build on Debian	35s
musl libc build on Alpine	41s
make static	52s
cross (s390x)	41s
cross (ppc64le)	45s
build libnvme and nvme-cli separately	41s
cross (armhf)	38s
windows-msys2-ucrt64	1m 47s
musl libc minimal static build on Debian	35s
nvme-cli (debian, clang, release)	1m 5s
nvme-cli (fedora, clang, release)	58s
nvme-cli (fedora, gcc, release)	57s
nvme-cli (tumbleweed, clang, debug)	54s
nvme-cli (tumbleweed, clang, release)	1m 2s
nvme-cli (tumbleweed, gcc, debug)	1m 8s
nvme-cli (tumbleweed, gcc, release)	1m 20s
nvme-cli (fedora, clang, debug)	55s
nvme-cli (debian, clang, debug)	1m 0s
nvme-cli (debian, gcc, debug)	56s
nvme-cli (fedora, gcc, debug)	50s
nvme-cli (debian, gcc, release)	1m 3s
fallback shared libraries	0s
	21m 1s

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