Add hackage shields to README #306

Job	Run time
cabal-check (9.6.6, 3.10.3.0, ubuntu-latest)	2m 16s
stylish-haskell (9.6.6, 3.12.1.0, ubuntu-latest)	2m 35s
cabal-fmt (9.6.6, 3.12.1.0, ubuntu-latest)	2m 37s
build (8.10.7, 3.12.1.0, ubuntu-latest)	2m 7s
build (8.10.7, 3.12.1.0, windows-latest)	3m 8s
build (8.10.7, 3.12.1.0, macOS-13)	1m 48s
build (9.2.8, 3.12.1.0, ubuntu-latest)	1m 57s
build (9.2.8, 3.12.1.0, windows-latest)	3m 42s
build (9.2.8, 3.12.1.0, macOS-13)	1m 23s
build (9.4.8, 3.12.1.0, ubuntu-latest)	2m 37s
build (9.4.8, 3.12.1.0, windows-latest)	4m 20s
build (9.4.8, 3.12.1.0, macOS-13)	1s
build (9.6.6, 3.12.1.0, ubuntu-latest)	3m 32s
build (9.6.6, 3.12.1.0, windows-latest)	3m 25s
build (9.6.6, 3.12.1.0, macOS-13)	1s
build (9.8.2, 3.12.1.0, ubuntu-latest)	1m 16s
build (9.8.2, 3.12.1.0, windows-latest)	3m 55s
build (9.8.2, 3.12.1.0, macOS-13)	1s
build (9.10.1, 3.12.1.0, ubuntu-latest)	1m 20s
build (9.10.1, 3.12.1.0, windows-latest)	3m 52s
build (9.10.1, 3.12.1.0, macOS-13)	1m 38s
build (9.6.6, 3.12.1.0, ubuntu-latest, no-debug)	2m 49s
	50m 20s

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