Merge 'readme' into HEAD #1549

Job	Run time
config	8s
win+VS build	0s
win build	5m 30s
documentation	5m 1s
linux32 (daald/ubuntu32:xenial)	11m 51s
linux-musl (alpine)	12m 15s
pedantic (fedora)	2m 5s
sparse	5m 0s
static-analysis	5m 30s
win+VS test	0s
linux-asan-ubsan (ubuntu-latest)	41m 1s
linux-gcc (ubuntu-20.04)	14m 39s
linux-gcc-default (ubuntu-latest)	9m 22s
linux-sha256 (ubuntu-latest)	9m 36s
linux-leaks (ubuntu-latest)	17m 52s
linux-TEST-vars (ubuntu-20.04)	17m 38s
osx-clang (macos-12)	32m 58s
osx-gcc (macos-12)	22m 8s
win test (0)	7m 28s
win test (1)	7m 21s
win test (2)	5m 36s
win test (3)	8m 16s
win test (4)	8m 46s
win test (6)	18m 56s
win test (5)	12m 3s
win test (7)	10m 50s
win test (8)	4m 33s
win test (9)	9m 54s
	5h 6m 17s

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