tests

docs: add integration testing documentation to README #764

Job	Run time
yarn-lockfile-check / lockfile-check	11s
linux-unit-tests / determine-node-versions	6s
linux-unit-tests / prevent-typescript-dependency	0s
linux-unit-tests / linux-unit-tests (20)	31s
linux-unit-tests / linux-unit-tests (22.17.0)	30s
windows-unit-tests / determine-node-versions	4s
nuts (ubuntu-latest) / yarn test:nuts	56s
nuts (windows-latest) / yarn test:nuts	15m 32s
windows-unit-tests / windows-unit-tests (20)	9m 21s
windows-unit-tests / windows-unit-tests (22.17.0)	9m 23s
	36m 34s

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