Add status badges in README.md #2652

Job	Run time
b2-windows (windows-2019)	27m 52s
b2-posix (ubuntu-20.04)	12m 42s
cmake-install-windows (windows-2019)	8m 28s
cmake-install-posix (ubuntu-20.04)	4m 31s
cmake-install-windows (windows-2022)	8m 57s
b2-windows (windows-2022)	28m 44s
b2-posix (ubuntu-22.04)	12m 48s
cmake-install-posix (ubuntu-22.04)	4m 25s
b2-posix (ubuntu-24.04)	14m 0s
cmake-install-posix (ubuntu-24.04)	5m 52s
b2-posix (macos-13)	27m 4s
cmake-install-posix (macos-13)	8m 3s
cmake-test-posix (ubuntu-latest)	37m 46s
b2-posix (macos-14)	10m 16s
cmake-test-posix-quick (ubuntu-20.04)	2m 38s
cmake-install-posix (macos-14)	4m 35s
b2-posix (macos-15)	10m 33s
cmake-test-posix-quick (ubuntu-22.04)	1m 40s
cmake-install-posix (macos-15)	5m 49s
cmake-test-posix-quick (ubuntu-24.04)	2m 36s
cmake-test-windows-quick (windows-2019)	5m 29s
cmake-test-posix-quick (macos-13)	4m 38s
cmake-test-windows-quick (windows-2022)	5m 35s
cmake-test-posix-quick (macos-14)	3m 38s
cmake-test-posix-quick (macos-15)	4m 22s
	4h 23m 1s

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