feat: node types readme #20

Job	Run time
rust-library-base / Feature Checks	47s
rust-library-base / Base Checks / doctest	1m 13s
rust-library-base / Base Checks / Clippy	58s
rust-library-base / Base Checks / Docs	50s
rust-library-base / Base Checks / Rustfmt	23s
rust-library-base / Base Checks / Test Suite	1m 15s
	5m 26s

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