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Update "First Script" documentation with C# example from .NET README #1764

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Run time

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Job	Run time
tests (windows, nightly)	20m 34s
tests (ubuntu, nightly)	4m 29s
tests (ubuntu, stable)	4m 34s
tests (macos, stable)	14m 7s
tests (windows, stable)	20m 15s
tests (macos, nightly)	8m 43s
	1h 12m 42s