docs: Add instructions on how to add new functionality #277

Job	Run time
build_dev_container / build_dev_container	1m 10s
format_code / fmt	4s
build / build	5m 44s
unit_test / test	5m 15s
lint / lint	4m 43s
integration_test / test	5m 7s
build_release_image / build	26s
	22m 29s

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