initial docify readme with some content #6333 #9512

Job	Run time
preflight / preflight	44s
preflight / ci-versions	1m 0s
test-frame-ui	1m 38s
cargo-check-benches (master)	1m 29s
test-full-crypto-feature	1m 29s
cargo-check-benches (current)	1m 37s
cargo-check-all-crate-macos	3m 21s
test-node-metrics	1m 29s
cargo-check-each-crate (1)	1m 29s
cargo-check-each-crate (2)	1m 28s
cargo-check-each-crate (3)	1m 28s
cargo-check-each-crate (4)	1m 28s
cargo-check-each-crate (5)	1m 29s
cargo-check-each-crate (6)	1m 29s
cargo-check-each-crate (7)	1m 29s
test-frame-examples-compile-to-wasm	1s
check-tracing	1s
test-deterministic-wasm	1s
node-bench-regression-guard	1s
check-metadata-hash	1s
All test misc tests passed	1s
	23m 13s

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