Add notes on project status to the README #190

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Job	Run time
rust-lint	16s
rust-test (ubuntu-latest, stable, colors)	12s
rust-test (ubuntu-latest, stable, threads)	14s
rust-test (ubuntu-latest, stable, timestamps)	19s
rust-test (ubuntu-latest, stable, stderr)	13s
rust-test (windows-latest, stable, colors)	43s
rust-test (windows-latest, stable, threads)	57s
rust-test (windows-latest, stable, timestamps)	40s
rust-test (windows-latest, stable, stderr)	38s
rust-test (macos-latest, stable, colors)	40s
rust-test (macos-latest, stable, threads)	30s
rust-test (macos-latest, stable, stderr)	45s
rust-test (ubuntu-latest, beta, colors,threads,timestamps)	15s
rust-test (ubuntu-latest, nightly, colors,threads,timestamps,nightly)	16s
rust-publish-crates	0s
	6m 38s

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