docs: improve readme #22

Job	Run time
cppcheck	33s
pre-commit	14s
macos-mamba	4m 28s
linux-mamba (gcc-9, gcc, gcc-9 g++-9, gcc-9, g++-9)	5m 21s
linux-mamba (gcc-10, gcc, gcc-10 g++-10, gcc-10, g++-10)	5m 38s
linux-mamba (gcc-11, gcc, gcc-11 g++-11, gcc-11, g++-11)	5m 42s
linux-mamba (gcc-12, gcc, gcc-12 g++-12, gcc-12, g++-12)	6m 37s
linux-mamba (clang-11, clang, clang-11, clang-11, clang++-11)	7m 20s
linux-mamba (clang-12, clang, clang-12, clang-12, clang++-12)	6m 42s
linux-mamba (clang-13, clang, clang-13, clang-13, clang++-13)	6m 20s
linux-mamba (clang-14, clang, clang-14, clang-14, clang++-14)	6m 26s
linux-mamba (clang-15, clang, clang-15, clang-15, clang++-15)	6m 22s
	1h 1m 43s

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