initial docify readme with some content #6333 #17837

Job	Run time
check-dependency-rules	9s
check-fail-ci	14s
check-markdown	14s
check-readme	3m 10s
check-workspace	16s
preflight / preflight	43s
preflight / ci-versions	58s
check-rust-feature-propagation	1m 55s
check-toml-format	2m 5s
fmt	1m 9s
test-rust-features	1m 55s
check-umbrella	2m 8s
All quick checks passed	1s
	14m 57s

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