docs: Add instructions on how to add new functionality #273

Job	Run time
build_dev_container / build_dev_container	1m 16s
format_code / fmt	7s
lint / lint	4m 37s
integration_test / test	6m 5s
build / build	6m 4s
unit_test / test	4m 54s
build_release_image / build	37s
	23m 40s

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