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add simple code sample to readme #55

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Job	Run time
tox (3.9)	1m 18s
tox (3.10)	56s
tox (3.11)	50s
tox (3.12)	1m 6s
tox (3.13)	1m 9s
tox (pypy3.9)	4m 17s
	9m 36s