feat: documentation for ROADM excel sheet input #247

Job	Run time
Tests on paywalled platforms (macos-13-xlarge, 3.12)	1m 44s
Tox test (py38)	3m 47s
Tests on other platforms (windows-2019, 3.10)	5m 42s
Tox test (py39)	3m 33s
Tests on other platforms (windows-2022, 3.11)	4m 33s
Tox test (py310)	3m 34s
Tests on other platforms (windows-2022, 3.12)	3m 55s
Tox test (py311)	3m 22s
Tests on other platforms (macos-12, 3.11)	1s
Tox test (py312-cover)	6m 41s
Tests on other platforms (macos-13, 3.12)	5m 30s
Tox test (docs, graphviz)	1m 45s
Docker image	54s
PyPI packaging	0s
	45m 1s

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