docs: Add instructions on how to add new functionality #275

Job	Run time
build_dev_container / build_dev_container	1m 27s
format_code / fmt	9s
unit_test / test	4m 59s
integration_test / test	5m 7s
build / build	6m 14s
lint / lint	4m 49s
build_release_image / build	25s
	23m 10s

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