add docs/python_airflow_operator.md required for Python Operator work… #94

Job	Run time
build / prepare	0s
build / pack-nuget	1m 56s
lint / Lint Go	4m 35s
lint / Lint TypeScript	56s
test / Golang Mod Up To Date	27s
test / Proto Up To Date	1m 54s
test / TypeScript Unit Tests	3m 5s
test / Golang Integration Tests	9m 25s
test / Golang Unit Tests	4m 29s
All required checks done	1s
	26m 48s

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