Add installation link to readme. (#1422) #972

Job	Run time
build-windows	46s
build-unix-like (ubuntu-22.04, g++-11, c++20)	26s
build-unix-like (ubuntu-22.04, g++-10, c++20)	35s
build-unix-like (ubuntu-22.04, g++-11, c++2b)	30s
build-unix-like (ubuntu-22.04, g++-12, c++20)	39s
build-unix-like (macos-latest, clang++, c++20)	20s
build-unix-like (ubuntu-24.04, clang++-17, c++20)	36s
build-unix-like (ubuntu-22.04, clang++-15, c++20)	51s
build-unix-like (ubuntu-22.04, g++-12, c++2b)	41s
build-unix-like (ubuntu-22.04, clang++-14, c++20)	35s
build-unix-like (ubuntu-24.04, clang++-16, c++20)	41s
build-unix-like (ubuntu-24.04, g++-14, c++2b)	1m 3s
build-unix-like (ubuntu-24.04, clang++-18, c++23)	41s
build-unix-like (ubuntu-24.04, clang++-18, c++20)	2m 30s
build-unix-like (ubuntu-22.04, clang++-12, c++20)	1m 2s
	11m 56s

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