initial docify readme with some content #6333 #9498

Job	Run time
preflight / preflight	39s
preflight / ci-versions	1m 2s
cargo-check-benches (master)	3m 30s
cargo-check-benches (current)	3m 34s
cargo-check-each-crate (1)	3m 28s
test-frame-ui	3m 25s
cargo-check-each-crate (2)	3m 25s
cargo-check-each-crate (3)	3m 25s
cargo-check-all-crate-macos	3m 57s
cargo-check-each-crate (4)	3m 25s
test-full-crypto-feature	2m 31s
cargo-check-each-crate (5)	3m 25s
test-node-metrics	3m 25s
cargo-check-each-crate (6)	3m 25s
cargo-check-each-crate (7)	3m 25s
test-frame-examples-compile-to-wasm	33s
test-deterministic-wasm	1s
check-tracing	1s
check-metadata-hash	1s
node-bench-regression-guard	1s
All test misc tests passed	1s
	46m 39s

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