Merge 'readme' into HEAD #1694

Job	Run time
config	4s
win+VS build	0s
win build	6m 28s
linux-asan-ubsan (ubuntu-latest)	1h 9m 36s
linux-gcc (ubuntu-20.04)	17m 48s
linux-gcc-default (ubuntu-latest)	13m 57s
linux-sha256 (ubuntu-latest)	14m 32s
linux-leaks (ubuntu-latest)	16m 2s
linux-TEST-vars (ubuntu-20.04)	17m 5s
osx-gcc (macos-12)	33m 57s
osx-clang (macos-12)	35m 3s
linux32 (daald/ubuntu32:xenial)	13m 43s
linux-musl (alpine)	9m 15s
pedantic (fedora)	3m 2s
documentation	5m 13s
win+VS test	0s
sparse	5m 20s
static-analysis	6m 53s
win test (3)	11m 28s
win test (0)	18m 48s
win test (2)	5m 24s
win test (1)	12m 26s
win test (4)	16m 17s
win test (5)	10m 52s
win test (6)	8m 2s
win test (7)	9m 51s
win test (8)	6m 56s
win test (9)	7m 25s
	6h 15m 27s

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