add installation section to README.md #3869

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Job	Run time
lint	11s
build (ubuntu-latest)	7m 16s
build (macos-12)	7m 17s
build-cross (s390x)	20m 26s
build (macos-14)	6m 27s
build (windows-latest)	8m 51s
min-cmake	8m 21s
rlbox	4m 47s
wasm2c-memchecked	7m 15s
emscripten	4m 51s
sanitize (asan, debug)	7m 19s
wasi	1m 9s
sanitize (asan, release)	8m 31s
sanitize (ubsan, debug)	7m 10s
sanitize (ubsan, release)	8m 59s
sanitize (fuzz, debug)	5m 33s
sanitize (fuzz, release)	6m 46s
	2h 1m 9s