chore: coverage badge on REDME #870

Job	Run time
Examples	8m 57s
xcodebuild (16) (test, IOS, 16.2)	7m 25s
xcodebuild (15) (test, IOS, 15.4)	5m 34s
xcodebuild (16) (test, MACOS, 16.2)	5m 30s
xcodebuild (15) (test, MAC_CATALYST, 15.4)	4m 41s
xcodebuild (16) (IOS, 16.2)	7m 59s
xcodebuild (15) (test, MACOS, 15.4)	4m 51s
xcodebuild (16) (MACOS, 16.2)	5m 30s
xcodebuild (15) (test, TVOS, 15.4)	4m 45s
xcodebuild (15) (test, VISIONOS, 15.4)	5m 26s
xcodebuild (15) (IOS, 15.2)	7m 41s
xcodebuild (15) (IOS, 15.4)	8m 39s
xcodebuild (15) (MAC_CATALYST, 15.4)	8m 10s
xcodebuild (15) (MACOS, 15.2)	5m 54s
xcodebuild (15) (MACOS, 15.4)	5m 1s
xcodebuild (15) (TVOS, 15.4)	4m 33s
xcodebuild (15) (VISIONOS, 15.4)	5m 3s
xcodebuild (15) (WATCHOS, 15.4)	5m 21s
	1h 51m 0s

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