docs: add serialization examples to README #19

Job	Run time
prepare_checks	3s
prepare_integration_checks	3s
run_integration_check (dev_py310)	1m 52s
run_integration_check (dev_py311)	1m 45s
run_integration_check (dev_py312)	1m 36s
run_integration_check (dev_py313-rc)	2m 15s
run_integration_check (dev_py39)	2m 3s
run_check (lint-check)	26s
run_check (lint-format)	28s
run_check (lint-mypy)	44s
run_check (test_package_py310)	33s
run_check (test_package_py311)	30s
run_check (test_package_py312)	31s
run_check (test_package_py313-rc)	37s
run_check (test_package_py39)	39s
run_check (test_py310)	1m 1s
run_check (test_py311)	1m 2s
run_check (test_py312)	1m 8s
run_check (test_py313-rc)	1m 15s
run_check (test_py39)	1m 8s
	19m 39s

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