Add "What's new" section to README #2080

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Run time

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Job	Run time
build (g++-11, Debug)	54s
build (g++-11, Release)	46s
build (g++-12, Debug)	53s
build (g++-12, Release)	1m 22s
build (g++-13, Debug)	54s
build (g++-13, Release)	1m 8s
build (clang++-15, Debug)	1m 14s
build (clang++-15, Release)	1m 9s
build (clang++-16, Debug)	1m 3s
build (clang++-16, Release)	1m 43s
build (clang++-17, Debug)	1m 12s
build (clang++-17, Release)	1m 18s
	13m 36s