feat: node types readme #21

Job	Run time
rust-library-base / Feature Checks	43s
rust-library-base / Base Checks / Clippy	40s
rust-library-base / Base Checks / Rustfmt	22s
rust-library-base / Base Checks / Docs	1m 1s
rust-library-base / Base Checks / Test Suite	1m 36s
rust-library-base / Base Checks / doctest	1m 8s
	5m 30s

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