Continuous integration

Add matrix badge and update communication to include matrix #11714

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Run time

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Job	Run time
Coverage	12m 45s
MSRV	2m 14s
Lint	4m 48s
Documentation	1m 29s
Formatting	12s
Fuzzing	1m 19s
Build & run examples	5m 45s
Test (macos-latest)	3m 16s
Test (windows-latest)	7m 14s
	39m 2s